AG: added traefik GH Action

.github/workflows/package-traefik.yaml

@@ -0,0 +1,56 @@
+name: package-traefik
+
+on:
+  push:
+    branches:
+      - 'main'
+    paths:
+      - 'traefik/**'
+
+  workflow_dispatch:
+
+jobs:
+  set-env:
+    name: Set Environment Variables
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.main.outputs.version }}
+      created: ${{ steps.main.outputs.created }}
+      image: ${{ steps.main.outputs.image }}
+      repository: ${{ steps.main.outputs.repository }}  
+    steps:
+      - id: main
+        run: |
+          echo ::set-output name=version::$(echo ${GITHUB_SHA} | cut -c1-7)
+          echo ::set-output name=created::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+          echo ::set-output name=image::reddog-traefik
+          echo ::set-output name=repository::ghcr.io/azure/reddog-retail-demo
+
+  package-service:
+    name: Package Service
+    runs-on: ubuntu-latest
+    needs: set-env
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1 
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.CR_PAT }}
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: traefik/Dockerfile
+          push: true
+          tags: |
+            ${{ needs.set-env.outputs.repository }}/${{ needs.set-env.outputs.image }}:latest
+            ${{ needs.set-env.outputs.repository }}/${{ needs.set-env.outputs.image }}:${{ needs.set-env.outputs.version }}
+          labels: |
+            org.opencontainers.image.source=${{ github.repositoryUrl }}
+            org.opencontainers.image.created=${{ needs.set-env.outputs.created }}
+            org.opencontainers.image.revision=${{ needs.set-env.outputs.version }}