Bug 1623024 - mozlint: run pylint at review phase r=linter-reviewers,ahal

Depends on D79099

Differential Revision: https://phabricator.services.mozilla.com/D79430

taskcluster/ci/source-test/mozlint.yml

@@ -217,6 +217,19 @@ py-flake8:
             # moz.configure files are also Python files.
             - '**/*.configure'
 
+py-pylint:
+    description: pylint run over the gecko codebase
+    treeherder:
+        symbol: py(pylint)
+    run:
+        mach: lint -v -l pylint -f treeherder -f json:/builds/worker/mozlint.json *
+    when:
+        files-changed:
+            - '**/*.py'
+            - 'tools/lint/pylint.yml'
+            # moz.configure files are also Python files
+            # However, pylint has some hard time dealing with it
+
 test-manifest:
     description: lint test manifests
     treeherder: