Run CI only on the main branch, on release branches and on PRs (#6720)

.github/workflows/checks.yml

@@ -1,5 +1,10 @@
 name: Checks
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+    - '[0-9]+.[0-9]+'
+  pull_request:
 
 concurrency:
   group: ${{github.workflow}}-${{ github.ref }}

.github/workflows/tests-macos.yml

@@ -1,5 +1,10 @@
 name: macOS
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+    - '[0-9]+.[0-9]+'
+  pull_request:
 
 concurrency:
   group: ${{github.workflow}}-${{ github.ref }}

.github/workflows/tests-ubuntu.yml

@@ -1,5 +1,10 @@
 name: Ubuntu
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+    - '[0-9]+.[0-9]+'
+  pull_request:
 
 concurrency:
   group: ${{github.workflow}}-${{ github.ref }}

.github/workflows/tests-windows.yml

@@ -1,5 +1,10 @@
 name: Windows
-on: [push, pull_request]
+on:
+  push:
+    branches:
+    - master
+    - '[0-9]+.[0-9]+'
+  pull_request:
 
 concurrency:
   group: ${{github.workflow}}-${{ github.ref }}