Add Dockerfile and GitHub Actions workflow for Docker build

- Introduced a Dockerfile to build the Rust application and create a slim Debian image for deployment.
- Added a GitHub Actions workflow to automate the Docker build and push process on pushes to the main branch and version tags.

Author: incubator4

.github/workflows/docker.yaml

@@ -0,0 +1,56 @@
+name: Docker Build
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+  id-token: write
+  pull-requests: write
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha
+            type=sha,format=long
+            type=sha,prefix={{branch}}-,enable=${{ !startsWith(github.ref, 'refs/tags') }},event=branch
+            type=sha,format=long,prefix={{branch}}-,enable=${{ !startsWith(github.ref, 'refs/tags') }},event=branch
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,18 @@
+FROM rust:1.89.0-slim-bullseye AS builder
+
+RUN apt update && apt install -y pkg-config libssl-dev
+
+WORKDIR /usr/src/app
+
+COPY . .
+
+RUN cargo build --release
+
+FROM debian:bullseye-slim
+
+RUN apt update && apt install -y libssl1.1 openssl ca-certificates git
+COPY --from=builder /usr/src/app/target/release/api* /usr/local/bin/
+
+EXPOSE 8000
+
+ENTRYPOINT [ "/usr/local/bin/api" ]