Schedule CI every month

Author: infertux

.github/workflows/rubocop.yml

@@ -1,6 +1,12 @@
 name: RuboCop
 
-on: [push, pull_request]
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+  schedule:
+    - cron: "0 0 1 * *" # first day of every month
 
 permissions:
   contents: read

.github/workflows/tests.yml

@@ -1,6 +1,12 @@
 name: Tests
 
-on: [push, pull_request]
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["master"]
+  schedule:
+    - cron: "0 0 1 * *" # first day of every month
 
 permissions:
   contents: read