images: fix the tagging docker images build from new tags

When docker image workflow is triggered based on the new tag push
which usually includes v as prefix, the workflow drops the v prefix.
As such, when v0.2.0 tag is pushed to GitHub, we end up with 0.2.0
tags in the docker images. This commit fixes the workflow to keep
the v prefix.

Signed-off-by: Feruzjon Muyassarov <[email protected]>

.github/workflows/publish-images.yaml

@@ -47,7 +47,7 @@ jobs:
               echo "  - digging out tag from git ref $GITREF..."
               case $GITREF in
                   refs/tags/v*)
-                      tag="${GITREF#refs/tags/v}"
+                      tag="${GITREF#refs/tags/}"
                       ;;
                   refs/heads/main)
                       tag=unstable