reset git otherwise shallow update not allowed

testdata/run.sh

@@ -74,18 +74,18 @@ function push_self() {
     local owner="$2"
 
     local dir="$DIR/self"
-    local sha=$(git rev-parse HEAD)
     git clone . $dir
     (
 	cd $dir
-	git checkout -b fortesting $sha
-	git remote rm origin
+	rm -fr .forgejo .git
+	git init
+	git checkout -b main
 	git remote add origin $forgejo/$owner/setup-forgejo
-	git rm -r .forgejo
+	git add .
+	git commit -m 'initial commit'
 	git config user.email root@example.com
 	git config user.name username
-	git commit -m 'avoid workflow infinite recursion'
-	git push --force origin fortesting:main
+	git push --force origin main
 	git tag --force vTest HEAD
 	git push --force origin vTest
     )