Also run checks on pull requests

.github/workflows/cargo_fmt.yml

@@ -1,14 +1,16 @@
 name: Cargo format
-on: [push]
-#  push:
-#    paths:
-#      - 'examples/*.rs'
-#      - 'libraries/**/*.rs'
-#      - 'src/**/*.rs'
-#      - 'patches/**'
-#      - '**/Cargo.toml'
-#      - '.cargo/config'
-#      - '!third_party/**'
+on:
+  push:
+    paths:
+      - 'examples/*.rs'
+      - 'libraries/**/*.rs'
+      - 'src/**/*.rs'
+      - 'patches/**'
+      - '**/Cargo.toml'
+      - '.cargo/config'
+      - '!third_party/**'
+  pull_request:
+    types: [opened, synchronize, reopened]
 
 jobs:
   cargo_format: