Add docker publish workflow

.github/workflows/publish-docker.yml

@@ -0,0 +1,36 @@
+# Referenced from: https://docs.github.com/en/actions/publishing-packages/publishing-docker-images#introduction
+name: Publish Docker to GHCR (Manual)
+
+on: workflow_dispatch
+
+env:
+    REGISTRY: ghcr.io
+    IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+    build-and-push-image:
+        runs-on: ubuntu-latest
+        permissions:
+            contents: read
+            packages: write
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v4
+            - name: Log in to the Container registry
+              uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+              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 }}
+            - name: Build and push Docker image
+              uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+              with:
+                  context: .
+                  push: true
+                  tags: ${{ steps.meta.outputs.tags }}
+                  labels: ${{ steps.meta.outputs.labels }}