ci: split validate and build jobs

.github/workflows/build.yml

@@ -18,8 +18,34 @@ env:
   DESTDIR: ./bin
 
 jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    outputs:
+      validate-targets: ${{ steps.validate-targets.outputs.matrix }}
+      artifact-platforms: ${{ steps.artifact-platforms.outputs.matrix }}
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Validate targets matrix
+        id: validate-targets
+        run: |
+          echo "matrix=$(docker buildx bake validate --print | jq -cr '.group.default.targets')" >> $GITHUB_OUTPUT
+      -
+        name: Artifact platforms matrix
+        id: artifact-platforms
+        run: |
+          echo "matrix=$(docker buildx bake artifact-all --print | jq -cr '.target."artifact-all".platforms')" >> $GITHUB_OUTPUT
+
   validate:
     runs-on: ubuntu-latest
+    needs:
+      - prepare
+    strategy:
+      fail-fast: false
+      matrix:
+        target: ${{ fromJson(needs.prepare.outputs.validate-targets) }}
     steps:
       -
         name: Checkout
@@ -31,8 +57,7 @@ jobs:
         name: Validate
         uses: docker/bake-action@v2
         with:
-          targets: validate
+          targets: ${{ matrix.target }}
-          pull: true
 
   test:
     runs-on: ubuntu-latest
@@ -57,10 +82,88 @@ jobs:
         with:
           directory: ${{ env.DESTDIR }}/coverage
 
-  build:
+  artifact:
     runs-on: ubuntu-latest
     needs:
+      - prepare
       - validate
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: ${{ fromJson(needs.prepare.outputs.artifact-platforms) }}
+    steps:
+      -
+        name: Prepare
+        run: |
+          platform=${{ matrix.platform }}
+          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Build
+        uses: docker/bake-action@v2
+        with:
+          targets: artifact
+          pull: true
+          set: |
+            *.platform=${{ matrix.platform }}
+            *.cache-from=type=gha,scope=artifact-${{ env.PLATFORM_PAIR }}
+            *.cache-to=type=gha,scope=artifact-${{ env.PLATFORM_PAIR }},mode=max
+      -
+        name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: diun
+          path: ${{ env.DESTDIR }}
+          if-no-files-found: error
+
+  release:
+    runs-on: ubuntu-latest
+    needs:
+      - artifact
+      - test
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: diun
+          path: ${{ env.DESTDIR }}
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      -
+        name: Build
+        uses: docker/bake-action@v2
+        with:
+          targets: release
+      -
+        name: GitHub Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          draft: true
+          files: |
+            ${{ env.DESTDIR }}/release/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  image:
+    runs-on: ubuntu-latest
+    needs:
+      - artifact
       - test
     steps:
       -
@@ -68,6 +171,17 @@ jobs:
         uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      -
+        name: Prepare
+        run: |
+          cfroms=
+          while read -r platform; do
+            if [ -n "$cfroms" ]; then cfroms="${cfroms}\n"; fi
+            cfroms="${cfroms}*.cache-from=type=gha,scope=artifact-${platform//\//-}"
+          done < <(docker buildx bake artifact-all --print | jq -r '.target."artifact-all".platforms[]')
+          echo "CACHE_FROMS<<EOF" >> $GITHUB_ENV
+          echo -e "$cfroms" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
       -
         name: Docker meta
         id: meta
@@ -108,25 +222,7 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
       -
-        name: Build artifacts
+        name: Build
-        uses: docker/bake-action@v2
-        with:
-          targets: artifact-all
-          pull: true
-      -
-        name: Release
-        uses: docker/bake-action@v2
-        with:
-          targets: release
-      -
-        name: Upload artifacts
-        uses: actions/upload-artifact@v3
-        with:
-          name: diun
-          path: ${{ env.DESTDIR }}/release/*
-          if-no-files-found: error
-      -
-        name: Build image
         uses: docker/bake-action@v2
         with:
           files: |
@@ -135,16 +231,8 @@ jobs:
           targets: image-all
           pull: true
           push: ${{ github.event_name != 'pull_request' }}
-      -
+          set: |
-        name: GitHub Release
+            ${{ env.CACHE_FROMS }}
-        uses: softprops/action-gh-release@v1
-        if: startsWith(github.ref, 'refs/tags/')
-        with:
-          draft: true
-          files: |
-            ${{ env.DESTDIR }}/release/*
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Check manifest
         if: github.event_name != 'pull_request'