Restore path restriction

This avoids running workflows when it's not needed

.github/workflows/mdlint.yml

 name: markdownlint
-on: [push]
-#  push:
-#    paths:
-#      - '**/*.md'
-#      - '.markdownlint.json'
-#      - '!third_party/**'
+on:
+  push:
+    paths:
+      - '**/*.md'
+      - '.markdownlint.json'
+      - '!third_party/**'
 
 jobs:
   mdlint:

.github/workflows/pylint.yml

 name: pylint
-on: [push]
-#  push:
-#    paths:
-#      - '**/*.py'
-#      - '.pylintrc'
-#      - '!third_party/**'
+on:
+  push:
+    paths:
+      - '**/*.py'
+      - '.pylintrc'
+      - '!third_party/**'
 jobs:
   pylint:
     runs-on: ubuntu-latest