Remove only the leading v from the tag when deploying to W.org

This also changes the sed flags to be less greedy by removing flags `gI.

Co-Authored-By: Helen Hou-Sandi <helen.y.hou@gmail.com>

Author: Nikschavan

entrypoint.sh

@@ -29,7 +29,7 @@ echo "ℹ︎ SLUG is $SLUG"
 # Does it even make sense for VERSION to be editable in a workflow definition?
 if [[ -z "$VERSION" ]]; then
 	VERSION=${GITHUB_REF#refs/tags/}
-	VERSION=$(echo $VERSION | sed -e "s/v//gI")
+	VERSION=$(echo $VERSION | sed -e "s/^v//")
 fi
 echo "ℹ︎ VERSION is $VERSION"