Add required EC labels to gateway Dockerfile

Adds distribution-scope, release, url, and vendor labels required
by Enterprise Contract validation for container image releases.

Signed-off-by: Daniel Farrell <[email protected]>

Author: dfarrell07

package/Dockerfile.submariner-gateway.konflux

@@ -73,10 +73,14 @@ LABEL com.redhat.component="submariner-gateway-container" \
       version="${BASE_BRANCH}" \
       summary="Submariner Gateway" \
       description="The Submariner Gateway facilitates secure connections between clusters." \
+      distribution-scope="public" \
       io.k8s.display-name="Submariner Gateway" \
       io.k8s.description="The Submariner Gateway handles the IPsec or WireGuard tunnels between clusters." \
       io.openshift.tags="submariner, submariner-gateway, rhacm" \
       maintainer="[email protected]" \
+      release="1" \
+      url="https://github.com/submariner-io/submariner" \
+      vendor="Red Hat, Inc." \
       com.github.url="https://github.com/submariner-io/submariner" \
       com.github.commit="${BASE_BRANCH}" \
       cpe="cpe:/a:redhat:acm:2.15::el9" \