Update Publish Docker workflow

.github/workflows/publish-docker.yml

@@ -25,7 +25,7 @@ jobs:
           echo ::set-output name=commit::${GITHUB_SHA}
           echo ::set-output name=build_date::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
           echo ::set-output name=docker_platforms::linux/amd64,linux/arm64,linux/arm
-          echo ::set-output name=docker_image::tautulli/tautulli
+          echo ::set-output name=docker_image::${{ secrets.DOCKER_REPO }}/tautulli
 
       - name: Set up Docker Buildx
         id: buildx
@@ -33,8 +33,8 @@ jobs:
         with:
           version: latest
 
-      - name: Checkout
-        uses: actions/checkout@v2
+      - name: Checkout Code
+        uses: actions/checkout@v2.1.0
 
       - name: Docker Buildx (no push)
         run: |