Attempt to speed up PR image builds by sharing a cache

.github/workflows/pr_release.yaml

@@ -7,165 +7,55 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  build-executor-slim:
+  build-images:
     env:
-      GITHUB_SHA: ${{ github.sha }}
-      GITHUB_REF: ${{ github.ref }}
       PLATFORMS: "linux/amd64,linux/arm64,linux/s390x,linux/ppc64le"
     runs-on: ubuntu-latest
-    steps:
-    - name: Clone source code
-      uses: actions/checkout@v2
-
-    - name: Get the tags
-      id: vars
-      run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
-
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      with:
-        platforms: ${{ env.PLATFORMS }}
-
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.os }}-buildx-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: docker/setup-buildx-action@v1
-      with:
-        version: latest
-
-
-    - uses: docker/build-push-action@v2
-      with:
-        context: .
-        file: ./deploy/Dockerfile_slim
-        platforms: linux/amd64,linux/arm64,linux/s390x,linux/ppc64le
-        tags: |
-          gcr.io/kaniko-project/executor:${{ env.GITHUB_SHA }}-slim
-
-  build-debug:
-    env:
-      GITHUB_SHA: ${{ github.sha }}
-      GITHUB_REF: ${{ github.ref }}
-      PLATFORMS: "linux/amd64,linux/arm64"
-    runs-on: ubuntu-latest
-    steps:
-    - name: Clone source code
-      uses: actions/checkout@v2
-
-    - name: Get the tags
-      id: vars
-      run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
-
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      with:
-        platforms: ${{ env.PLATFORMS }}
-
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.os }}-buildx-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: docker/setup-buildx-action@v1
-      with:
-        version: latest
-
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+        - executor
+        - executor-debug
+        - executor-slim
+        - warmer
+
+        include:
+        - image: executor
+          dockerfile: ./deploy/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          name: gcr.io/kaniko-project/executor:${{ github.sha }}
+
+        - image: executor-debug
+          dockerfile: ./deploy/Dockerfile_debug
+          platforms: linux/amd64,linux/arm64
+          name: gcr.io/kaniko-project/executor:${{ github.sha }}-debug
+
+        - image: executor-slim
+          dockerfile: ./deploy/Dockerfile_slim
+          platforms: linux/amd64,linux/arm64,linux/s390x,linux/ppc64le
+          name: gcr.io/kaniko-project/executor:${{ github.sha }}-slim
+
+        - image: warmer
+          dockerfile: ./deploy/Dockerfile_warmer
+          name: gcr.io/kaniko-project/warmer:${{ github.sha }}
+          platforms: linux/amd64,linux/arm64
 
-    - uses: docker/build-push-action@v2
-      with:
-        context: .
-        file:  ./deploy/Dockerfile_debug
-        platforms: linux/amd64,linux/arm64
-        tags: |
-          gcr.io/kaniko-project/executor:${{ env.GITHUB_SHA }}-debug
-
-  build-warmer:
-    env:
-      GITHUB_SHA: ${{ github.sha }}
-      GITHUB_REF: ${{ github.ref }}
-      PLATFORMS: "linux/amd64,linux/arm64"
-    runs-on: ubuntu-latest
-    steps:
-    - name: Clone source code
-      uses: actions/checkout@v2
-
-    - name: Get the tags
-      id: vars
-      run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
-
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      with:
-        platforms: ${{ env.PLATFORMS }}
-
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.os }}-buildx-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: docker/setup-buildx-action@v1
-      with:
-        version: latest
-
-    - uses: docker/build-push-action@v2
-      with:
-        context: .
-        file: ./deploy/Dockerfile_warmer
-        platforms: linux/amd64,linux/arm64
-        tags: |
-          gcr.io/kaniko-project/warmer:${{ env.GITHUB_SHA }}
-
-  build-executor:
-    env:
-      GITHUB_SHA: ${{ github.sha }}
-      GITHUB_REF: ${{ github.ref }}
-      PLATFORMS: "linux/amd64,linux/arm64"
-    runs-on: ubuntu-latest
     steps:
-    - name: Clone source code
-      uses: actions/checkout@v2
-
-    - name: Get the tags
-      id: vars
-      run: echo ::set-output name=tag::${GITHUB_REF/refs\/tags\//}
+    - uses: actions/checkout@v2
 
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
+    - uses: docker/setup-qemu-action@v1
       with:
-        platforms: ${{ env.PLATFORMS }}
+        platforms: ${{ matrix.platforms }}
 
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.os }}-buildx-${{ github.sha }}
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: docker/setup-buildx-action@v1
-      with:
-        version: latest
+    - uses: docker/setup-buildx-action@v1
 
     - uses: docker/build-push-action@v2
       with:
         context: .
-        file: ./deploy/Dockerfile
-        platforms: linux/amd64,linux/arm64
-        tags: |
-          gcr.io/kaniko-project/executor:${{ env.GITHUB_SHA }}
+        file: ${{ matrix.dockerfile }}
+        platforms: ${{ matrix.platforms }}
+        tags: ${{ matrix.name }}
+        # https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md#github-cache
+        cache-from: type=gha
+        cache-to: type=gha,mode=max