feat: Add GHCR support for image publishing and manifests

This commit introduces support for GitHub Container Registry (GHCR) in the
messaging-topology-operator's CI/CD pipeline. Previously, images were only
pushed to Docker Hub and Quay.io.

Key changes include:
* Updating the GitHub Actions workflow to log in to GHCR and push built images.
* Modifying the Makefile to define the GHCR image and generate Kubernetes
  manifests that reference the GHCR hosted images.

This enhancement allows for broader distribution and accessibility of the
operator images.

Author: Zerpet

.github/workflows/build-test-publish.yml

@@ -63,16 +63,19 @@ jobs:
     permissions:
       contents: 'write'
       id-token: 'write'
+      packages: 'write'
     outputs:
       image_tag: ${{ steps.meta.outputs.version }}
     steps:
     - name: Checkout code
       uses: actions/checkout@v5
 
     - name: Install Go
+      id: set-go
       uses: actions/setup-go@v6
       with:
         go-version-file: go.mod
+        check-latest: true
 
     - name: OCI Metadata
       id: meta
@@ -81,6 +84,7 @@ jobs:
         images: |
           rabbitmqoperator/messaging-topology-operator
           quay.io/rabbitmqoperator/messaging-topology-operator
+          ghcr.io/rabbitmq/messaging-topology-operator
         # generate Docker tags based on the following events/attributes
         tags: |
           type=sha
@@ -93,22 +97,30 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Login to Docker Hub
-      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      if: ${{ github.event_name != 'pull_request' && startsWith(github.ref, 'refs/tags/v') }}
       uses: docker/login-action@v3
       with:
         username: ${{ secrets.DOCKERHUB_USERNAME }}
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
     - name: Login to Quay.io
-      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      if: ${{ github.event_name != 'pull_request' && startsWith(github.ref, 'refs/tags/v') }}
       uses: docker/login-action@v3
       with:
         registry: quay.io
         username: ${{ secrets.QUAY_USERNAME }}
         password: ${{ secrets.QUAY_ROBOT_TOKEN }}
 
+    - name: Login to GHCR
+      if: ${{ github.event_name != 'pull_request' && startsWith(github.ref, 'refs/tags/v') }}
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
     - name: Build and push
-      if: ${{ startsWith(github.ref, 'refs/tags/v') }}
+      if: ${{ github.event_name != 'pull_request' && startsWith(github.ref, 'refs/tags/v') }}
       uses: docker/build-push-action@v6
       with:
         context: .
@@ -117,6 +129,8 @@ jobs:
         provenance: false
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
+        build-args: |
+          GO_TAG=${{ steps.set-go.outputs.go-version }}
 
     - name: Build to TAR
       id: build_tar
@@ -128,6 +142,8 @@ jobs:
         labels: ${{ steps.meta.outputs.labels }}
         outputs: |
           type=docker,dest=./operator.tar
+        build-args: |
+          GO_TAG=${{ steps.set-go.outputs.go-version }}
 
     - name: Upload Operator artifact
       uses: actions/upload-artifact@v4
@@ -149,7 +165,7 @@ jobs:
         kustomize edit set image \
         rabbitmqoperator/messaging-topology-operator-dev=rabbitmqoperator/messaging-topology-operator:"${RELEASE_VERSION}"
         popd
-        make generate-manifests QUAY_IO_OPERATOR_IMAGE=quay.io/rabbitmqoperator/messaging-topology-operator:"${RELEASE_VERSION}"
+        make generate-manifests QUAY_IO_OPERATOR_IMAGE=quay.io/rabbitmqoperator/messaging-topology-operator:"${RELEASE_VERSION}" GHCR_IO_OPERATOR_IMAGE=ghcr.io/rabbitmq/messaging-topology-operator:"${RELEASE_VERSION}"
 
     - name: Upload operator manifests
       uses: actions/upload-artifact@v4
@@ -174,6 +190,10 @@ jobs:
       contents: 'write'
       id-token: 'write'
     needs: build_operator
+    env:
+      # Taken from https://github.com/kubernetes-sigs/kind/releases/tag/v0.18.0
+      # The image here should be listed under 'Images built for this release' for the version of kind in go.mod
+      KIND_NODE_IMAGE: "kindest/node:v1.32.0"
     steps:
     - name: Check out code
       uses: actions/checkout@v5

Dockerfile

@@ -1,5 +1,6 @@
+ARG GO_TAG=1.24
 # Build the manager binary
-FROM --platform=$BUILDPLATFORM golang:1.24 AS builder
+FROM --platform=$BUILDPLATFORM golang:${GO_TAG} AS builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests

Makefile

@@ -159,15 +159,18 @@ api-reference: install-tools
 		--max-depth 30
 
 QUAY_IO_OPERATOR_IMAGE ?= quay.io/rabbitmqoperator/messaging-topology-operator:latest
+GHCR_IO_OPERATOR_IMAGE ?= ghcr.io/rabbitmq/messaging-topology-operator:latest
 ## used in CI pipeline to create release artifact
 .PHONY: generate-manifests
 generate-manifests: | $(YTT)
 	mkdir -p releases
 	kustomize build config/installation/  > releases/messaging-topology-operator.bak
 	sed '/CERTIFICATE_NAMESPACE.*CERTIFICATE_NAME/d' releases/messaging-topology-operator.bak > releases/messaging-topology-operator.yaml
 	$(YTT) -f releases/messaging-topology-operator.yaml -f config/ytt_overlays/change_deployment_image.yml --data-value operator_image=$(QUAY_IO_OPERATOR_IMAGE) > releases/messaging-topology-operator-quay-io.yaml
+	$(YTT) -f releases/messaging-topology-operator.yaml -f config/ytt_overlays/change_deployment_image.yml --data-value operator_image=$(GHCR_IO_OPERATOR_IMAGE) > releases/messaging-topology-operator-ghcr-io.yaml
 	kustomize build config/installation/cert-manager/ > releases/messaging-topology-operator-with-certmanager.yaml
 	$(YTT) -f releases/messaging-topology-operator-with-certmanager.yaml -f config/ytt_overlays/change_deployment_image.yml --data-value operator_image=$(QUAY_IO_OPERATOR_IMAGE) > releases/messaging-topology-operator-with-certmanager-quay-io.yaml
+	$(YTT) -f releases/messaging-topology-operator-with-certmanager.yaml -f config/ytt_overlays/change_deployment_image.yml --data-value operator_image=$(GHCR_IO_OPERATOR_IMAGE) > releases/messaging-topology-operator-with-certmanager-ghcr-io.yaml
 
 # Run go fmt against code
 fmt: