Add GHCR build/publish workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,197 @@
+name: Build & Publish Images
+
+on:
+  push:
+    branches: [ main, dev ]
+    tags:
+      - '*'
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_BACKEND: papercrate-dms/papercrate-backend
+  IMAGE_FRONTEND: papercrate-dms/papercrate-frontend
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        component: [backend, frontend]
+        platform: [linux/amd64, linux/arm64]
+
+    permissions:
+      contents: read
+      packages: write
+      id-token: write
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set component metadata
+        run: |
+          if [ "${{ matrix.component }}" = "backend" ]; then
+            echo "COMPONENT_CONTEXT=./backend" >> "$GITHUB_ENV"
+            echo "COMPONENT_IMAGE=${{ env.IMAGE_BACKEND }}" >> "$GITHUB_ENV"
+          else
+            echo "COMPONENT_CONTEXT=./frontend" >> "$GITHUB_ENV"
+            echo "COMPONENT_IMAGE=${{ env.IMAGE_FRONTEND }}" >> "$GITHUB_ENV"
+          fi
+          echo "COMPONENT_NAME=${{ matrix.component }}" >> "$GITHUB_ENV"
+
+      - name: Compute tags
+        env:
+          GITHUB_SHA: ${{ github.sha }}
+          GITHUB_REF: ${{ github.ref }}
+          REGISTRY: ${{ env.REGISTRY }}
+          PLATFORM: ${{ matrix.platform }}
+        run: |
+          ARCH=${PLATFORM#*/}
+          TAGS=("${GITHUB_SHA::7}")
+
+          BRANCH=${GITHUB_REF##*/}
+          if [ "$BRANCH" = "dev" ]; then
+            TAGS+=("${GITHUB_SHA::7}-dev")
+          fi
+
+          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
+            TAGS+=("${GITHUB_REF#refs/tags/}")
+          fi
+
+          UNIQUE=()
+          for tag in "${TAGS[@]}"; do
+            [[ -z "$tag" ]] && continue
+            skip=false
+            for seen in "${UNIQUE[@]}"; do
+              if [ "$tag" = "$seen" ]; then
+                skip=true
+                break
+              fi
+            done
+            if [ "$skip" = false ]; then
+              UNIQUE+=("$tag")
+            fi
+          done
+
+          {
+            echo "BASE_TAGS<<EOF"
+            for tag in "${UNIQUE[@]}"; do
+              printf '%s\n' "$tag"
+            done
+            echo "EOF"
+            echo "IMAGE_TAGS<<EOF"
+            for tag in "${UNIQUE[@]}"; do
+              printf '%s\n' "$REGISTRY/$COMPONENT_IMAGE:${tag}-${ARCH}"
+            done
+            echo "EOF"
+            echo "ARCH=$ARCH"
+          } >> "$GITHUB_ENV"
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build & push ${{ env.COMPONENT_NAME }} (${{ matrix.platform }})
+        uses: docker/build-push-action@v5
+        with:
+          context: ${{ env.COMPONENT_CONTEXT }}
+          push: true
+          platforms: ${{ matrix.platform }}
+          tags: ${{ env.IMAGE_TAGS }}
+
+  manifest:
+    runs-on: ubuntu-latest
+    needs: build
+    strategy:
+      matrix:
+        component: [backend, frontend]
+
+    permissions:
+      contents: read
+      packages: write
+
+    env:
+      REGISTRY: ghcr.io
+      ARCHES: amd64 arm64
+
+    steps:
+      - name: Set component metadata
+        run: |
+          if [ "${{ matrix.component }}" = "backend" ]; then
+            echo "COMPONENT_IMAGE=${{ env.IMAGE_BACKEND }}" >> "$GITHUB_ENV"
+          else
+            echo "COMPONENT_IMAGE=${{ env.IMAGE_FRONTEND }}" >> "$GITHUB_ENV"
+          fi
+          echo "COMPONENT_NAME=${{ matrix.component }}" >> "$GITHUB_ENV"
+
+      - name: Compute base tags
+        env:
+          GITHUB_SHA: ${{ github.sha }}
+          GITHUB_REF: ${{ github.ref }}
+        run: |
+          TAGS=("${GITHUB_SHA::7}")
+
+          BRANCH=${GITHUB_REF##*/}
+          if [ "$BRANCH" = "dev" ]; then
+            TAGS+=("${GITHUB_SHA::7}-dev")
+          fi
+
+          if [[ "$GITHUB_REF" == refs/tags/* ]]; then
+            TAGS+=("${GITHUB_REF#refs/tags/}")
+          fi
+
+          UNIQUE=()
+          for tag in "${TAGS[@]}"; do
+            [[ -z "$tag" ]] && continue
+            skip=false
+            for seen in "${UNIQUE[@]}"; do
+              if [ "$tag" = "$seen" ]; then
+                skip=true
+                break
+              fi
+            done
+            if [ "$skip" = false ]; then
+              UNIQUE+=("$tag")
+            fi
+          done
+
+          {
+            echo "BASE_TAGS<<EOF"
+            for tag in "${UNIQUE[@]}"; do
+              printf '%s\n' "$tag"
+            done
+            echo "EOF"
+          } >> "$GITHUB_ENV"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create manifests for ${{ env.COMPONENT_NAME }}
+        run: |
+          while IFS= read -r tag; do
+            [ -n "$tag" ] || continue
+            args=()
+            for arch in $ARCHES; do
+              args+=("$REGISTRY/$COMPONENT_IMAGE:${tag}-${arch}")
+            done
+            docker buildx imagetools create \
+              --tag "$REGISTRY/$COMPONENT_IMAGE:$tag" \
+              "${args[@]}"
+          done <<< "$BASE_TAGS"