Add examples for pushing artifacts with GH Actions

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

action/README.md

@@ -32,7 +32,7 @@ You can download a specific version with:
       - name: Setup Flux CLI
         uses: fluxcd/flux2/action@main
         with:
-          version: 0.8.0
+          version: 0.32.0
 ```
 
 ### Automate Flux updates
@@ -74,6 +74,86 @@ jobs:
               ${{ steps.update.outputs.flux_version }}
 ```
 
+### Push Kubernetes manifests to container registries
+
+Example workflow for publishing Kubernetes manifests bundled as OCI artifacts to GitHub Container Registry:
+
+```yaml
+name: push-artifact-staging
+
+on:
+  push:
+    branches:
+      - 'main'
+
+permissions:
+  packages: write # needed for ghcr.io access
+
+env:
+  OCI_REPO: "oci://ghcr.io/my-org/manifests/${{ github.event.repository.name }}"
+
+jobs:
+  kubernetes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Flux CLI
+        uses: fluxcd/flux2/action@main
+      - name: Generate manifests
+        run: |
+          kustomize build ./manifests/staging > ./deploy/app.yaml
+      - name: Push manifests
+        run: |
+          flux push artifact $OCI_REPO:$(git rev-parse --short HEAD) \
+            --path="./deploy" \
+            --source="$(git config --get remote.origin.url)" \
+            --revision="$(git branch --show-current)/$(git rev-parse HEAD)"
+      - name: Deploy manifests to staging
+        run: |
+          flux tag artifact $OCI_REPO:$(git rev-parse --short HEAD) --tag staging
+```
+
+Example workflow for publishing Kubernetes manifests bundled as OCI artifacts to Docker Hub:
+
+```yaml
+name: push-artifact-production
+
+on:
+  push:
+    tags:
+      - '*'
+
+env:
+  OCI_REPO: "oci://docker.io/my-org/app-config"
+
+jobs:
+  kubernetes:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Flux CLI
+        uses: fluxcd/flux2/action@main
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Generate manifests
+        run: |
+          kustomize build ./manifests/production > ./deploy/app.yaml
+      - name: Push manifests
+        run: |
+          flux push artifact $OCI_REPO:$(git tag --points-at HEAD) \
+            --path="./deploy" \
+            --source="$(git config --get remote.origin.url)" \
+            --revision="$(git tag --points-at HEAD)/$(git rev-parse HEAD)"
+      - name: Deploy manifests to production
+        run: |
+          flux tag artifact $OCI_REPO:$(git tag --points-at HEAD) --tag production
+```
+
 ### End-to-end testing
 
 Example workflow for running Flux in Kubernetes Kind: