Push signed multi-arch image to GHCR

- Build multi-arch image with Docker buildx and xx
- Push image to GHCR
- Sign image with Cosign and GitHub OIDC

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

.github/workflows/release.yaml

@@ -10,6 +10,9 @@ permissions:
   id-token: write # needed for keyless signing
   packages: write # needed for ghcr access
 
+env:
+  CONTROLLER: ${{ github.event.repository.name }}
+
 jobs:
   release:
     runs-on: ubuntu-latest
@@ -28,6 +31,43 @@ jobs:
             ${{ runner.os }}-go-
       - uses: sigstore/cosign-installer@main
       - uses: anchore/sbom-action/download-syft@v0
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: fluxcdbot
+          password: ${{ secrets.GHCR_TOKEN }}
+      - name: Prepare
+        id: prep
+        run: |
+          VERSION="${{ github.event.inputs.tag }}-${GITHUB_SHA::8}"
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF/refs\/tags\//}
+          fi
+          echo ::set-output name=BUILD_DATE::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+          echo ::set-output name=VERSION::${VERSION}
+      - name: Publish multi-arch container image
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          builder: ${{ steps.buildx.outputs.name }}
+          context: .
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          tags: |
+            ghcr.io/fluxcd/${{ env.CONTROLLER }}:${{ steps.prep.outputs.VERSION }}
+          labels: |
+            org.opencontainers.image.title=${{ github.event.repository.name }}
+            org.opencontainers.image.description=${{ github.event.repository.description }}
+            org.opencontainers.image.url=${{ github.event.repository.html_url }}
+            org.opencontainers.image.source=${{ github.event.repository.html_url }}
+            org.opencontainers.image.revision=${{ github.sha }}
+            org.opencontainers.image.version=${{ steps.prep.outputs.VERSION }}
+            org.opencontainers.image.created=${{ steps.prep.outputs.BUILD_DATE }}
+      - name: Sign multi-arch container image
+        env:
+          COSIGN_EXPERIMENTAL: 1
+        run: |
+          cosign sign ghcr.io/fluxcd/${{ env.CONTROLLER }}:${{ steps.prep.outputs.VERSION }}
       - uses: goreleaser/goreleaser-action@v2
         with:
           version: latest

.goreleaser.yaml

@@ -5,6 +5,17 @@ builds:
 
 release:
   prerelease: auto
+  footer: |
+    ## Signed images
+    
+    Verify and pull the container image:
+
+    ```
+    COSIGN_EXPERIMENTAL=1 cosign verify ghcr.io/fluxcd/{{.ProjectName}}:{{.Tag}}
+    docker pull ghcr.io/fluxcd/{{.ProjectName}}:{{.Tag}}
+    ```
+    
+    Supported architectures: `linux/amd64`, `linux/arm64` and `linux/arm/v7`.
 
 changelog:
   use: github-native

CONTRIBUTING.md

@@ -40,9 +40,9 @@ meeting](https://docs.google.com/document/d/1l_M0om0qUEN_NNiGgpqJ2tvsF2iioHkaARD
 ### How to run the test suite
 
 Prerequisites:
-* go >= 1.16
-* kubebuilder >= 3.0
-* kustomize >= 4.0
+* go >= 1.17
+* docker >= 20.10
+* kustomize >= 4.4
 
 You can run the unit tests by simply doing
 

Dockerfile

@@ -1,7 +1,15 @@
-FROM golang:1.17-alpine as builder
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine as builder
+
+# Copy the build utilities.
+COPY --from=xx / /
+
+ARG TARGETPLATFORM
 
 WORKDIR /workspace
 
+# copy api submodule
+COPY api/ api/
+
 # copy modules manifests
 COPY go.mod go.mod
 COPY go.sum go.sum
@@ -14,7 +22,8 @@ COPY main.go main.go
 COPY controllers/ controllers/
 
 # build
-RUN CGO_ENABLED=0 go build -a -o source-watcher main.go
+ENV CGO_ENABLED=0
+RUN xx-go build -a -o source-watcher main.go
 
 FROM alpine:3.15
 

Makefile

@@ -1,6 +1,5 @@
-
 # Image URL to use all building/pushing image targets
-IMG ?= controller:latest
+IMG ?= fluxcd/source-watcher:latest
 # Produce CRDs that work back to Kubernetes 1.16
 CRD_OPTIONS ?= crd:crdVersions=v1
 
@@ -11,6 +10,11 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+# Allows for defining additional Docker buildx arguments, e.g. '--push'.
+BUILD_ARGS ?=
+# Architectures to build images for.
+BUILD_PLATFORMS ?= linux/amd64
+
 # Architecture to use envtest with
 ENVTEST_ARCH ?= amd64
 
@@ -63,8 +67,12 @@ generate: controller-gen
 	$(CONTROLLER_GEN) object:headerFile="hack/boilerplate.go.txt" paths="./..."
 
 # Build the docker image
-docker-build: test
-	docker build . -t ${IMG}
+docker-build:
+	docker buildx build \
+	--platform=$(BUILD_PLATFORMS) \
+	-t ${IMG} \
+	--load \
+	${BUILD_ARGS} .
 
 # Push the docker image
 docker-push:

config/manager/deployment.yaml

@@ -20,7 +20,7 @@ spec:
       terminationGracePeriodSeconds: 10
       containers:
         - name: manager
-          image: source-watcher
+          image: ghcr.io/fluxcd/source-watcher
           imagePullPolicy: IfNotPresent
           securityContext:
             allowPrivilegeEscalation: false

config/manager/kustomization.yaml

@@ -3,6 +3,6 @@ kind: Kustomization
 resources:
   - deployment.yaml
 images:
-  - name: source-watcher
-    newName: source-watcher
-    newTag: v0.2.0
+  - name: ghcr.io/fluxcd/source-watcher
+    newName: ghcr.io/fluxcd/source-watcher
+    newTag: v0.10.0