Add login step to publishing of images (open-telemetry#141)

Signed-off-by: Juraci Paixão Kröhling <[email protected]>

Author: jpkrohling

.github/workflows/publish-images.yaml

@@ -23,7 +23,7 @@ jobs:
         id: docker_meta
         uses: crazy-max/ghaction-docker-meta@v1
         with:
-          images: otel/opentelemetry-operator,quay.io/opentelemetry/opentelemetry-operator
+          images: quay.io/opentelemetry/opentelemetry-operator
           tag-sha: true
 
       - name: Set up QEMU
@@ -40,6 +40,13 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
 
+      - name: Login to Quay
+        uses: docker/login-action@v1 
+        with:
+          registry: quay.io
+          username: ${{ secrets.QUAY_USERNAME }}
+          password: ${{ secrets.QUAY_PASSWORD }}
+
       - name: Build and push Operator image
         uses: docker/build-push-action@v2
         with: