pythongh-100072: only trigger netlify builds for doc changes

Author: sobolevn

.github/workflows/doc.yml

@@ -21,9 +21,10 @@ on:
     - '3.8'
     - '3.7'
     paths:
+    - '.github/workflows/doc.yml'
+    # Should be in sync with `netlify.toml`:
     - 'Doc/**'
     - 'Misc/**'
-    - '.github/workflows/doc.yml'
 
 permissions:
   contents: read

netlify.toml

@@ -2,6 +2,9 @@
     base = "Doc/"
     command = "make html"
     publish = "build/html"
+    # Do not trigger netlify builds if docs were not changed.
+    # Changed files should be in sync with `.github/workflows/doc.yml`
+    ignore = "git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF ./Doc ./Misc ./netlify.toml"
 
 [build.environment]
   PYTHON_VERSION = "3.8"