add CI to build image and push to ghcr

Signed-off-by: David van der Spek <vanderspek.david@gmail.com>

.github/workflows/ci.yaml

@@ -0,0 +1,51 @@
+name: CI / cert-manager webhook
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+jobs:
+  publish:
+    name: Test build and push cert-manager-webhook container
+    runs-on: ubuntu-latest
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+      packages: 'write'
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v4
+      with:
+        # list of Docker images to use as base name for tags
+        images: |
+          ghcr.io/pluralsh/plural-certmanager-webhook
+        # generate Docker tags based on the following events/attributes
+        tags: |
+          type=sha
+          type=ref,event=pr
+          type=ref,event=branch
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v2
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+    - name: Login to GHCR
+      uses: docker/login-action@v2
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Build and push
+      uses: docker/build-push-action@v3
+      with:
+        context: "."
+        file: "./Dockerfile"
+        push: true
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        platforms: linux/amd64,linux/arm64

.github/workflows/publish.yaml

@@ -21,9 +21,9 @@ jobs:
       with:
         # list of Docker images to use as base name for tags
         images: |
+          ghcr.io/pluralsh/plural-certmanager-webhook
           dkr.plural.sh/bootstrap/plural-certmanager-webhook
           gcr.io/pluralsh/plural-certmanager-webhook
-          ghcr.io/pluralsh/plural-certmanager-webhook
         # generate Docker tags based on the following events/attributes
         tags: |
           type=semver,pattern={{version}}