Fix CI for version

Author: archessmn

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
       - run: docker image tag balancer:latest ghcr.io/ystv/balancer:${{github.ref_name}}-${{github.run_number}}
         if: github.ref_type == 'branch'
       - run: \
-          docker image tag balancer:latest ghcr.io/ystv/balancer:latest \
+          docker image tag balancer:latest ghcr.io/ystv/balancer:latest && \
           docker image tag balancer:latest ghcr.io/ystv/balancer:${{github.ref_name}}
         if: github.ref_type == 'tag'
       - name: Log in to the Container registry