Add Github workflow to build the image

.github/workflows/docker.yml

@@ -0,0 +1,59 @@
+name: Build and publish OCI image
+
+on:
+  push:
+    # Publish semver tags as releases.
+    tags: [ 'v*.*.*' ]
+
+env:
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: Build and push OCI image to docker.io registry
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.workflow_run.head_branch }}
+
+      - name: Get tag
+        id: tag
+        uses: dawidd6/action-get-tag@v1
+
+      - uses: docker/setup-qemu-action@v2
+      - uses: docker/setup-buildx-action@v2
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          build-args: "RELEASE=${{ steps.tag.outputs.tag }}"
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

CHANGELOG.md

@@ -1,6 +1,12 @@
 k8s-mutate-image-and-policy
 ====
 
+# Version v3.3.1 -- 23.11.2021
+
+## Other
+
+- Build image via Github workflow
+
 # Version v3.3.0 -- 16.09.2021
 
 ## Enhancement