docs: build only if doc files were changed (#85)

Author: Mishig

.github/workflows/build_documentation.yml

@@ -2,8 +2,12 @@ name: Build documentation
 
 on:
   push:
+    paths:
+      - "docs/source/**"
     branches:
       - main
+      - doc-builder*
+      - v*-release
 
 jobs:
    build:

.github/workflows/build_pr_documentation.yml

@@ -2,6 +2,8 @@ name: Build PR Documentation
 
 on:
   pull_request:
+    paths:
+      - "docs/source/**"
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}