Use correct tag on publishing basic-auth container

This fixes the Github Actions CI to publish the correct auth container
tag. Previously it was using latest-dev not the git tag

Signed-off-by: Alistair Hey <alistair@heyal.co.uk>

.github/workflows/publish.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Get Repo Owner
         id: get_repo_owner
         run: echo ::set-output name=repo_owner::$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')
-      - name: Build ${{ matrix.svc }}
+      - name: Publish ${{ matrix.svc }}
         uses: docker/build-push-action@v2
         with:
           context: ./gateway
@@ -65,7 +65,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
       - name: Get TAG
         id: get_tag
-        run: echo ::set-output name=TAG::latest-dev
+        run: echo ::set-output name=TAG::${GITHUB_REF#refs/tags/}
       - name: Login to Docker Registry
         uses: docker/login-action@v1
         with:
@@ -75,7 +75,7 @@ jobs:
       - name: Get Repo Owner
         id: get_repo_owner
         run: echo ::set-output name=repo_owner::$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')
-      - name: Build ${{ matrix.svc }}
+      - name: Publish ${{ matrix.svc }}
         uses: docker/build-push-action@v2
         with:
           context: ./auth/${{ matrix.svc }}