infra: actions: fix docker changes detector so it doesnt always build on force pushes

.gitea/workflows/gentoo-utils.yml

@@ -29,6 +29,7 @@ jobs:
           # slugify
           image_tag="$(echo "$image_tag" | sed -E 's/[^a-zA-Z0-9]/-/g')"
 
+
           # rebase breaks gitea.event.before, so check to make sure the hash provided exists
           if ! git merge-base --is-ancestor $comparison_hash $branch_name >/dev/null 2>&1; then
             comparison_hash=$(git merge-base origin/$default_branch_name $branch_name)