added js sdk publish image workflow

Author: ashleysmithTTD

.github/workflows/publish-jssdk-example.yml

@@ -0,0 +1,38 @@
+name: Release JS SDK Example Docker Image
+run-name: ${{ github.action_ref == 'refs/head/main' && 'Release' || 'Publish Pre-release' }} JS SDK Example Docker Image by @${{ github.actor }}
+
+on:
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: iabtechlab/uid2-js-sdk-example
+
+jobs:
+  build-cstg-example:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=sha,format=short
+      - name: Build and push Docker JS SDK Example image
+        uses: docker/build-push-action@v5
+        with:
+          context: examples/cstg
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}