deplyoment: add debug build / container / docs (#1513)

.github/workflows/docker-master.yaml

@@ -1,4 +1,4 @@
-name: Docker Tag - Master
+name: Docker Master
 on:
   push:
     branches:
@@ -10,6 +10,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+
       - name: Docker Publish - Master
         uses: zenato/docker-action@master
         with:
@@ -17,3 +18,20 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
           repository: pomerium/pomerium
           tag: master
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USER }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker Publish - Debug
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile.debug
+          push: true
+          tags: pomerium/pomerium:debug