Speed up CI image pull by switching to GHCR and adding a minimal test stage

Author: danrmiller

.github/workflows/build-ci-image.yaml

@@ -28,13 +28,24 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push
+      - name: Build and push full image
         uses: docker/build-push-action@v7
         with:
           context: .
+          target: full
           push: true
           tags: |
             ${{ env.GHCR_IMAGE }}:latest
             ${{ env.GHCR_IMAGE }}:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
+
+      - name: Build and push test image
+        uses: docker/build-push-action@v7
+        with:
+          context: .
+          target: test
+          push: true
+          tags: ${{ env.GHCR_IMAGE }}:test
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ jobs:
       contents: read
       packages: read
     container:
-      image: ghcr.io/${{ github.repository_owner }}/stackwallet-ci:latest
+      image: ghcr.io/${{ github.repository_owner }}/stackwallet-ci:test
       credentials:
         username: ${{ github.actor }}
         password: ${{ github.token }}

Dockerfile

@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.7
-FROM ubuntu:24.04
+FROM ubuntu:24.04 AS full
 
 ENV DEBIAN_FRONTEND=noninteractive \
     TZ=Etc/UTC \
@@ -78,3 +78,35 @@ RUN git clone --depth 1 --branch 3.38.1 https://github.com/flutter/flutter.git "
 RUN git config --system --add safe.directory '*'
 
 RUN flutter --version && rustc --version && cargo --version && node --version
+
+
+# Minimal image for flutter test (no Rust, no Android SDK, no cross-compilers)
+FROM ubuntu:24.04 AS test
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    TZ=Etc/UTC \
+    LANG=C.UTF-8 \
+    LC_ALL=C.UTF-8
+
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      ca-certificates curl file git unzip xz-utils \
+      build-essential cmake ninja-build pkg-config \
+      clang libclang-dev \
+      libgirepository1.0-dev libglib2.0-dev libgtk-3-dev \
+      libjsoncpp-dev liblzma-dev libsecret-1-dev libssl-dev \
+ && rm -rf /var/lib/apt/lists/*
+
+ENV FLUTTER_HOME=/opt/flutter \
+    PATH=/opt/flutter/bin:/opt/flutter/bin/cache/dart-sdk/bin:$PATH
+
+RUN git clone --depth 1 --branch 3.38.1 https://github.com/flutter/flutter.git "$FLUTTER_HOME" \
+ && git config --global --add safe.directory '*' \
+ && flutter config --no-analytics \
+ && flutter precache --linux \
+ && chmod -R a+rwX "$FLUTTER_HOME"
+
+RUN git config --system --add safe.directory '*'
+
+RUN flutter --version