chore: Use built-in "stopper"

Signed-off-by: Tim Hårek Andreassen <tim@harek.no>

.build.yml

@@ -19,7 +19,7 @@ tasks:
         tag=$(git describe --exact-match --tags HEAD 2>/dev/null || true)
         if [ -z "$tag" ]; then
             echo "Current commit is not a tag; not building anything"
-            exit 0
+            complete-build
         fi
 
         version=$(echo "$tag" | tr -d 'v')