feat: leverage cache to prevent unnecessary pushing and building (#14)

* feat: leverage cache to prevent unnecessary pushing and building

* fix: combine test build and test suite to leverage cache

* fix: revert inadvertently changed parts

* fix: review-requested changes

* fix: update test tags to use static ci tag

.github/workflows/default_on_push.yml

@@ -5,23 +5,13 @@ on:
     branches: [ "master", "stable" ]
 
 jobs:
-  build:
+  build-and-test-image:
     runs-on: ubuntu-20.04
-    outputs:
-      imagetag: ${{ steps.prep.outputs.imagetag }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2
         with:
           submodules: recursive
-      - name: Prepare
-        id: prep
-        run: |
-          DOCKER_IMAGE=docker.io/mailserver/testing
-          TAGS="${DOCKER_IMAGE}:${GITHUB_SHA::8},${DOCKER_IMAGE}:latest"
-          echo ::set-output name=tags::${TAGS}
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
         id: buildx
@@ -32,11 +22,6 @@ jobs:
           key: ${{ runner.os }}-buildx-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-buildx-
-      - name: Login to DockerHub
-        uses: docker/login-action@v1
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build image locally
         uses: docker/build-push-action@v2
         with:
@@ -46,35 +31,26 @@ jobs:
           build-args: |
             VCS_REF=${{ github.sha }}
             VCS_VER=${{ github.ref }}
-          platforms: linux/amd64,linux/arm/v7,linux/arm64
-          pull: true
-          push: true
-          tags: ${{ steps.prep.outputs.tags }}
+          platforms: linux/amd64
+          load: true
+          tags: mailserver-testing:ci
           cache-to: type=local,dest=/tmp/.buildx-cache
-
-  test:
-    needs: build
-    runs-on: ubuntu-20.04
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          submodules: recursive
-      - name: run test suite
-        run: |
-          NAME=docker.io/mailserver/testing:${GITHUB_SHA::8} bash -c 'make generate-accounts tests'
+      - name: Run test suite
+        run: >
+          NAME=mailserver-testing:ci
+          bash -c 'make generate-accounts tests'
         env:
           CI: true
 
-  publish:
-    needs: test
+  build-multiarch-and-publish:
+    needs: build-and-test-image
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout
         uses: actions/checkout@v2
         with:
           submodules: recursive
-      - name: Prepare
+      - name: Prepare tags
         id: prep
         run: |
           DOCKER_IMAGE=docker.io/mailserver/docker-mailserver
@@ -111,7 +87,6 @@ jobs:
             VCS_REF=${{ github.sha }}
             VCS_VER=${{ github.ref }}
           platforms: linux/amd64,linux/arm/v7,linux/arm64
-          pull: true
           push: true
           tags: ${{ steps.prep.outputs.tags }}
           cache-from: type=local,src=/tmp/.buildx-cache

.github/workflows/test_merge_requests.yml

@@ -6,35 +6,24 @@ jobs:
   build-and-test:
     runs-on: ubuntu-20.04
     steps:
-      -
-        name: Checkout
+      - name: Checkout
         uses: actions/checkout@v2
         with:
           submodules: recursive
-      -
-        name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-      -
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
-        id: buildx
-      -
-        name: Build image locally
+      - name: Build image locally
         uses: docker/build-push-action@v2
         with:
-          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./Dockerfile
           build-args: |
             VCS_REF=${{ github.sha }}
             VCS_VER=${{ github.ref }}
-          context: .
-          file: ./Dockerfile
-          load: true
           platforms: linux/amd64
-          tags: docker.io/mailserver/testing:ci
-      -
-        name: Run all tests
+          load: true
+          tags: mailserver-testing:ci
+      - name: Run test suite
         run: >
-          NAME=docker.io/mailserver/testing:ci
+          NAME=mailserver-testing:ci
           bash -c 'make generate-accounts tests'
         env:
           CI: true