adding in the docker push for the rc images (#1182)

.github/workflows/build.yml

@@ -106,7 +106,7 @@ jobs:
           chmod +x ./build.sh
           ./build.sh
 
-      - name: tag release branch
+      - name: tag rc branch
         if: github.ref == 'refs/heads/rc'
         run: ./build.sh tag rc
 
@@ -129,6 +129,13 @@ jobs:
         if: github.ref == 'refs/heads/master' || github.event_name == 'release'
         run: docker images
 
+      - name: Push rc images
+        if: github.ref == 'refs/heads/rc'
+        run: ./build.sh push rc 
+        env:
+          DOCKER_CONTENT_TRUST: 1
+          DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE: ${{ secrets.DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE }}
+
       - name: Push dev images
         if: github.ref == 'refs/heads/master' || github.event_name == 'release'
         run: ./build.sh push dev