Update main.yml

.github/workflows/main.yml

@@ -7,8 +7,10 @@
 name: build
 
 # Controls when the workflow will run
-on: 
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
   push:
+    branches: [ "main" ]
   #pull_request:
   #  branches: [ "main" ]
 
@@ -30,8 +32,8 @@ jobs:
       - uses: actions/setup-python@v4
         with:
           python-version: '3.9'
-          cache: pip
+          cache: 'pip' # caching pip dependencies
       # install dependencies listed in requirements.txt file
-      - run: python3 -m pip install -r requirements.txt
+      - run: pip install -r requirements.txt
       # deploy mkdocs to github pages
       - run: mkdocs gh-deploy --force --clean --verbose