Build and push container image for all main line commits: (#340)

## Description


This will make available container images for all commits on main in between releases.

## Why is this needed



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

.github/workflows/ci.yaml

@@ -8,6 +8,9 @@ on:
 env:
   CGO_ENABLED: 0
   GO_VERSION: '1.21'
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  IMAGE_NAME: ${{ github.repository }}
 
 jobs:
   validate:
@@ -60,3 +63,47 @@ jobs:
           check_hidden: true
           skip: "./.git,./go.mod,./go.sum"
           ignore_words_list: ro
+
+  build-and-push-image:
+    name: Build and push manager image
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Login to ghcr.io
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v3
+      with:
+        registry: ${{ env.REGISTRY }}
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+      with:
+        images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+        tags: |
+            type=sha
+            type=raw,value=latest
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Build and push Docker image
+      id: build-and-push
+      uses: docker/[email protected]
+      with:
+        context: .
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        platforms: ${{ github.event_name != 'pull_request' && 'linux/amd64,linux/arm64' || 'linux/amd64' }}