Add publish workflow to build and push curator-manager image to ghcr

.github/workflows/publish.yaml

@@ -0,0 +1,30 @@
+name: publish
+
+on:
+  push:
+    branches:
+      - main
+
+  registry_package:
+    types:
+      - published
+    name:
+      - ghcr.io/dystewart/curator-manager:latest
+  workflow_dispatch:     
+
+jobs:
+  publish-vault-k8s-login:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Login to GitHub Container Registry
+      - uses: actions/checkout@v2
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.PUBLISH_SECRET }}
+      - name: Build the Docker image
+        run: |
+         make docker-build -t ghcr.io/dystewart/curator-manager:latest
+         docker push ghcr.io/dystewart/curator-manager:latest