Clean up a bit based on @fendor review

Author: alanz

.gitignore

@@ -14,3 +14,10 @@ shake.yaml.lock
 
 .vscode
 /test-logs/
+
+# stack 2.1 stack.yaml lock files
+stack*.yaml.lock
+shake.yaml.lock
+
+# ignore hie.yaml's for testdata
+test/**/*.yaml