diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..9dd69c2
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,4 @@
+.git
+.github
+README.md
+LICENSE
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 5489313..b29f159 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -26,7 +26,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log into GitHub Container Registry
-        # if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
@@ -37,13 +37,14 @@ jobs:
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
-          context: .
+          context: ./zephyr-base
           file: ./zephyr-base/Dockerfile
-          # push: ${{ github.event_name != 'pull_request' }}
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64
           provenance: false
           tags: ghcr.io/${{ github.repository_owner }}/zephyr:base-${{ matrix.sdk }}SDK
+          cache-from: type=gha,scope=zephyr-base-${{ matrix.sdk }}
+          cache-to: type=gha,mode=max,scope=zephyr-base-${{ matrix.sdk }}
           build-args: |
             ZEPHYR_SDK_VERSION=${{ matrix.sdk }}
 
@@ -166,7 +167,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log into GitHub Container Registry
-        # if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
@@ -177,13 +178,14 @@ jobs:
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
-          context: .
+          context: ./zephyr
           file: ./zephyr/Dockerfile
-          # push: ${{ github.event_name != 'pull_request' }}
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64
           provenance: false
           tags: ghcr.io/${{ github.repository_owner }}/zephyr:${{ matrix.toolchain.nick }}-${{ matrix.sdk }}SDK
+          cache-from: type=gha,scope=zephyr-arch-${{ matrix.sdk }}-${{ matrix.toolchain.nick }}
+          cache-to: type=gha,mode=max,scope=zephyr-arch-${{ matrix.sdk }}-${{ matrix.toolchain.nick }}
           build-args: |
             BASE_IMAGE=ghcr.io/embeddedcontainers/zephyr:base-${{ matrix.sdk }}SDK
             ZEPHYR_SDK_TOOLCHAINS=-t ${{ matrix.toolchain.arch }}
@@ -210,7 +212,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log into GitHub Container Registry
-        # if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
@@ -221,13 +223,14 @@ jobs:
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
-          context: .
+          context: ./zephyr
           file: ./zephyr/Dockerfile
-          # push: ${{ github.event_name != 'pull_request' }}
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64,linux/arm64
           provenance: false
-          tags: ghcr.io/${{ github.repository_owner }}/zephyr:llvm${{ matrix.sdk }}SDK
+          tags: ghcr.io/${{ github.repository_owner }}/zephyr:llvm-${{ matrix.sdk }}SDK
+          cache-from: type=gha,scope=zephyr-llvm-${{ matrix.sdk }}
+          cache-to: type=gha,mode=max,scope=zephyr-llvm-${{ matrix.sdk }}
           build-args: |
             BASE_IMAGE=ghcr.io/embeddedcontainers/zephyr:base-${{ matrix.sdk }}SDK
             ZEPHYR_SDK_TOOLCHAINS=-l
@@ -254,7 +257,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Log into GitHub Container Registry
-        # if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ghcr.io
@@ -265,13 +268,14 @@ jobs:
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
-          context: .
+          context: ./zephyr-posix
           file: ./zephyr-posix/Dockerfile
-          # push: ${{ github.event_name != 'pull_request' }}
-          push: true
+          push: ${{ github.event_name != 'pull_request' }}
           platforms: linux/amd64
           provenance: false
           tags: ghcr.io/${{ github.repository_owner }}/zephyr:posix-${{ matrix.sdk }}SDK
+          cache-from: type=gha,scope=zephyr-posix-${{ matrix.sdk }}
+          cache-to: type=gha,mode=max,scope=zephyr-posix-${{ matrix.sdk }}
           build-args: |
             BASE_IMAGE=ghcr.io/embeddedcontainers/zephyr:base-${{ matrix.sdk }}SDK
             ZEPHYR_SDK_VERSION=${{ matrix.sdk }}
diff --git a/zephyr-base/Dockerfile b/zephyr-base/Dockerfile
index d09edff..110bd2b 100644
--- a/zephyr-base/Dockerfile
+++ b/zephyr-base/Dockerfile
@@ -1,11 +1,14 @@
+# syntax=docker/dockerfile:1.7
 FROM debian:stable-slim
 
-ARG ZEPHYR_SDK_VERSION=0.16.4
+ARG ZEPHYR_SDK_VERSION=1.0.0
 ARG ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION}
 
 # OS dependencies and packages
 
-RUN \
+ENV VIRTUAL_ENV=/opt/venv
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
   apt-get -y update \
   && apt-get -y install --no-install-recommends \
   ca-certificates \
@@ -13,12 +16,21 @@ RUN \
   device-tree-compiler \
   git \
   ninja-build \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
+  python3 \
+  python3-pip \
+  python3-venv \
+  && python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+# West
+
+RUN --mount=type=cache,target=/root/.cache/pip,sharing=locked \
+  pip install wheel west
 
 # Zephyr SDK
 
-RUN \
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
   export sdk_file_name="zephyr-sdk-${ZEPHYR_SDK_VERSION}_linux-$(uname -m)_minimal.tar.xz" \
   && apt-get -y update \
   && apt-get -y install --no-install-recommends \
@@ -32,21 +44,6 @@ RUN \
   && apt-get remove -y --purge \
   wget \
   xz-utils \
+  && apt-get autoremove -y \
   && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
-
-# Python
-
-ENV VIRTUAL_ENV=/opt/venv
-RUN \
-  apt-get -y update \
-  && apt-get -y install --no-install-recommends \
-  python3 \
-  python3-pip \
-  python3-venv \
-  && python3 -m venv $VIRTUAL_ENV
-ENV PATH="$VIRTUAL_ENV/bin:$PATH"
-
-# West
-
-RUN pip install --no-cache-dir wheel west
\ No newline at end of file
+  && rm -rf /var/lib/apt/lists/*
\ No newline at end of file
diff --git a/zephyr-posix/Dockerfile b/zephyr-posix/Dockerfile
index aa7d434..d9eeecc 100644
--- a/zephyr-posix/Dockerfile
+++ b/zephyr-posix/Dockerfile
@@ -1,29 +1,24 @@
-ARG ZEPHYR_SDK_VERSION=0.17.0
+# syntax=docker/dockerfile:1.7
+ARG ZEPHYR_SDK_VERSION=1.0.0
 ARG ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION}
 ARG BASE_IMAGE="zephyr:base-${ZEPHYR_SDK_VERSION}SDK"
 
 FROM ${BASE_IMAGE}
 
-# OS dependencies and packages
-
-RUN \
-  apt-get -y update \
-  && apt-get -y install --no-install-recommends \
-  gcc-multilib \
-  make \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
-
-# Zephyr SDK
+# OS dependencies and Zephyr SDK posix setup
 
 ARG ZEPHYR_SDK_INSTALL_DIR
 
-RUN \
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
   apt-get -y update \
   && apt-get -y install --no-install-recommends \
+  gcc-multilib \
+  make \
   wget \
   && ${ZEPHYR_SDK_INSTALL_DIR}/setup.sh -c \
   && apt-get remove -y --purge \
   wget \
+  && apt-get autoremove -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*
\ No newline at end of file
diff --git a/zephyr/Dockerfile b/zephyr/Dockerfile
index ab590f1..7c29403 100644
--- a/zephyr/Dockerfile
+++ b/zephyr/Dockerfile
@@ -1,3 +1,4 @@
+# syntax=docker/dockerfile:1.7
 ARG ZEPHYR_SDK_VERSION=1.0.0
 ARG ZEPHYR_SDK_INSTALL_DIR=/opt/toolchains/zephyr-sdk-${ZEPHYR_SDK_VERSION}
 ARG ZEPHYR_SDK_TOOLCHAINS="-t arm-zephyr-eabi"
@@ -10,7 +11,8 @@ FROM ${BASE_IMAGE}
 ARG ZEPHYR_SDK_INSTALL_DIR
 ARG ZEPHYR_SDK_TOOLCHAINS
 
-RUN \
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,target=/var/lib/apt/lists,sharing=locked \
   apt-get -y update \
   && apt-get -y install --no-install-recommends \
   xz-utils \
@@ -19,5 +21,6 @@ RUN \
   && apt-get remove -y --purge \
   wget \
   xz-utils \
+  && apt-get autoremove -y \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*