Update ci-tests.yml

added monthly tests

.github/workflows/ci-tests.yml

@@ -1,16 +1,20 @@
 name: test-pr
 
 on:
+    push:
+        branches: [main]
     pull_request:
-        # Run on pull requests against the main branch
+        # The branches below must be a subset of the branches above
         branches: [main]
+    schedule:
+        - cron: "0 0 1 * *"
 
 jobs:
     build:
         runs-on: ${{ matrix.os }}
         strategy:
           matrix:
-            python-version: [3.8]
+            python-version: ["3.10"]
             os: [ubuntu-latest]
         env:
           OS: ${{ matrix.os }}