Revert docs CICD trigger on push to main instead of tag-based (#180)

Co-authored-by: Hien To <tominhhien97@gmail.com>

Author: hiento09

.github/workflows/docs.yml

@@ -7,7 +7,6 @@ on:
     paths:
       - 'docs/**'
       - '.github/workflows/docs.yml'
-    tags: ["v[0-9]+.[0-9]+.[0-9]+-docs"]
   pull_request:
     branches:
       - main
@@ -75,13 +74,13 @@ jobs:
               Preview URL: ${{ steps.deployCloudflarePages.outputs.url }}
 
       - name: Add Custome Domain file
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+        if: github.event_name == 'push' && github.event.pull_request.head.repo.full_name != github.repository
         run: echo "${{ vars.DOCUSAURUS_DOMAIN }}" > ./docs/build/CNAME
 
       # Popular action to deploy to GitHub Pages:
       # Docs: https://github.com/peaceiris/actions-gh-pages#%EF%B8%8F-docusaurus
       - name: Deploy to GitHub Pages
-        if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+        if: github.event_name == 'push' && github.event.pull_request.head.repo.full_name != github.repository
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}