Add acceptance test for repo-clone

acceptance/testdata/repos/repo-clone.txtar

@@ -0,0 +1,15 @@
+# Use gh as a credential helper
+exec gh auth setup-git
+
+# Create a repository with a file so it has a default branch
+exec gh repo create $ORG/$SCRIPT_NAME-$RANDOM_STRING --add-readme --private
+
+# Defer repo cleanup
+defer gh repo delete --yes $ORG/$SCRIPT_NAME-$RANDOM_STRING
+
+# Clone the repo
+exec gh repo clone $ORG/$SCRIPT_NAME-$RANDOM_STRING
+
+# Ensure the repo was cloned
+exec ls $SCRIPT_NAME-$RANDOM_STRING
+stdout README.md