Add github job to tag image as latest

.github/workflows/tag_latest.yml

@@ -0,0 +1,26 @@
+name: Tag image as latest
+
+on:
+  workflow_dispatch:
+    inputs:
+      sha:
+        description: 'SHA of image to tag as latest'
+        required: true
+        default: "sha-"
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+
+    steps:
+        - uses: shrink/actions-docker-registry-tag@v3
+          with:
+            registry: ${{ env.REGISTRY }}
+            repository: ${{ github.repository }}
+            target: ${{ github.event.inputs.sha }}
+            tags: |
+              latest