feat: Add Publish GitHub workflow

.github/workflows/publish.yml

@@ -0,0 +1,90 @@
+name: Publish
+
+on:
+  push:
+    branches:
+      - master
+  release:
+    types:
+      - created
+
+env:
+  GITHUB_REF_NAME: ${{ github.event.release.tag_name }}
+  IMAGE_NAME: cdalvaro/saltstack-master
+  PLATFORMS: linux/amd64 linux/arm64 linux/arm/v7
+  DOCKER_CLI_EXPERIMENTAL: enabled
+
+jobs:
+  build-and-publish:
+    name: Build and publish
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Enable Docker experimental
+        run: |
+          # Enable docker daemon experimental support.
+          echo '{"experimental": true}' | sudo tee /etc/docker/daemon.json
+          sudo systemctl restart docker
+          # Install QEMU multi-architecture support for docker buildx.
+          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+      - name: Instantiate docker buildx builder
+        run: |
+          docker buildx create --use
+          docker buildx inspect --bootstrap
+
+      - name: Cache latest images
+        run: |
+          for PLATFORM in ${PLATFORMS}; do
+            docker pull --platform "${PLATFORM}" "${IMAGE_NAME}:latest"
+          done
+
+      - name: Log in to Docker Hub
+        run: |
+          echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u="${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Build and push Docker image
+        run: |
+          docker buildx build \
+            --platform "${PLATFORMS// /,}" \
+            --cache-from "${IMAGE_NAME}:latest" \
+            --push --progress plain \
+            --build-arg=VCS_REF="${GITHUB_SHA::7}" \
+            --build-arg=BUILD_DATE="$(date +"%Y-%m-%d %H:%M:%S%:z")" \
+            --tag="${IMAGE_NAME}:${GITHUB_REF_NAME:-latest}" .
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    needs: build-and-publish
+    steps:
+      - name: Enable Docker experimental
+        run: |
+          # Enable docker daemon experimental support.
+          echo '{"experimental": true}' | sudo tee /etc/docker/daemon.json
+          sudo systemctl restart docker
+          # Install QEMU multi-architecture support for docker buildx.
+          docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+
+      - name: Test images
+        env:
+          CONTAINER_NAME: salt_master_test
+        run: |
+          IMAGE_TAG="${GITHUB_REF_NAME:-latest}"
+          DOCKER_IMAGE="${IMAGE_NAME}:${IMAGE_TAG}"
+          for PLATFORM in ${PLATFORMS}; do
+            echo "Testing docker image ${DOCKER_IMAGE} on platform ${PLATFORM} ..."
+            # test
+            docker pull -q --platform "${PLATFORM}" "${DOCKER_IMAGE}"
+            docker run --rm -d --name "${CONTAINER_NAME}" "${DOCKER_IMAGE}"
+            docker container ls
+            sleep 20
+            docker exec "${CONTAINER_NAME}" salt --versions
+            echo "healthcheck"
+            docker exec "${CONTAINER_NAME}" /usr/local/sbin/healthcheck
+            # cleanup
+            docker stop ${CONTAINER_NAME}
+            docker image rm "${DOCKER_IMAGE}"
+          done