ci: name tags consistently

ci/RELEASE.sh

@@ -52,7 +52,7 @@ test -n "$V" || { echo "Could not obtain version." ; exit 1 ; }
 # This is the signing key ID associated with the GitHub account adriaandegroot,
 # which is used to create all "verified" tags in the Calamares repo.
 KEY_ID="128F00873E05AF1D"
-git tag -u "$KEY_ID" "v$V" || { echo "Could not sign tag v$V." ; exit 1 ; }
+git tag -u "$KEY_ID" -m "Release v$V" "v$V" || { echo "Could not sign tag v$V." ; exit 1 ; }
 
 ### Create the tarball
 #