Add docker build for banzai and push to ghcr

.github/workflows/build-docker.yml

@@ -0,0 +1,58 @@
+name: Docker Image
+
+concurrency: ${{ github.workflow }}-${{ github.ref }}
+
+on:
+  push:
+    branches:
+      - "*"
+    tags:
+      - "*"
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build-push:
+
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      packages: write
+
+    env:
+      REGISTRY: ghcr.io
+      IMAGE_NAME: ${{ github.repository }}
+
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+        with:
+          install: true
+
+      - name: Login to Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and also push Dockerimage (only build on PRs)
+        id: build-and-push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}