ci: only update doc when doc related files changed

Author: soumyamahunt

.github/workflows/main.yml

@@ -121,9 +121,6 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v3
 
-    - name: Setup repository
-      uses: ./.github/actions/setup
-
     - name: Check version bump
       id: check_version_bump
       uses: mathieudutour/[email protected]
@@ -132,14 +129,27 @@ jobs:
         default_bump: false
         dry_run: true
 
-    - name: Build package documentation
+    - name: Check change in documentation
+      id: changed_doc
       if:  steps.check_version_bump.outputs.release_type == ''
+      uses: tj-actions/[email protected]
+      with:
+        files: |
+          Sources/**/*
+          Package*.swift
+
+    - name: Setup repository
+      if:  steps.changed_doc.outputs.any_changed == 'true'
+      uses: ./.github/actions/setup
+
+    - name: Build package documentation
+      if:  steps.changed_doc.outputs.any_changed == 'true'
       run: |
         npm run build
         npm run serve-doc
 
     - name: Update GitHub Pages
-      if:  steps.check_version_bump.outputs.release_type == ''
+      if:  steps.changed_doc.outputs.any_changed == 'true'
       uses: JamesIves/[email protected]
       with:
           branch: gh-pages