try to make tests "fork agnostic". still don't know if this works

Author: Patrick Poetz

.github/workflows/dockerhub.yml

@@ -11,7 +11,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Build and Publish Docker image to Dockerhub
-        uses: ${{ github.repository }}@master
+        uses: "${{ github.repository }}@master"
         with:
           TAG: 'my-optional-tag-name'
           DOCKERFILE_PATH: '.github/docker/Dockerfile'

.github/workflows/gpr.yaml

@@ -11,7 +11,7 @@ jobs:
       with:
         fetch-depth: 1
     - name: Publish Docker Image to GPR
-      uses: ${{ github.repository }}@master
+      uses: "${{ github.repository }}@master"
       with:
         IMAGE_NAME: 'test-docker-action-v2'
         TAG: 'my-optional-tag-name'