build: skip long-running Actions for README-only modifications

If the only file modified is README.md do not run test-linux or
build-windows tasks. This will help streamline onboarding sessions but
may help some other cases too.

PR-URL: #40571
Reviewed-By: Voltrex <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

.github/workflows/build-windows.yml

@@ -2,6 +2,8 @@ name: build-windows
 
 on:
   pull_request:
+    paths-ignore:
+      - "README.md"
     types: [opened, synchronize, reopened, ready_for_review]
   push:
     branches:
@@ -10,6 +12,8 @@ on:
       - canary
       - v[0-9]+.x-staging
       - v[0-9]+.x
+    paths-ignore:
+      - "README.md"
 
 env:
   PYTHON_VERSION: '3.10'

.github/workflows/test-linux.yml

@@ -2,6 +2,8 @@ name: test-linux
 
 on:
   pull_request:
+    paths-ignore:
+      - "README.md"
     types: [opened, synchronize, reopened, ready_for_review]
   push:
     branches:
@@ -10,6 +12,8 @@ on:
       - canary
       - v[0-9]+.x-staging
       - v[0-9]+.x
+    paths-ignore:
+      - "README.md"
 
 env:
   PYTHON_VERSION: '3.10'