Runs minimum workflow upon pull_request

#16

Author: hansonchar

.github/workflows/blueprint.yml

@@ -1,6 +1,7 @@
 name: Compile blueprint
 
 on:
+  pull_request:
   push:
     branches:
       - main # Trigger on pushes to the default branch
@@ -54,8 +55,9 @@ jobs:
 
       - name: Build project API documentation
         run: ~/.elan/bin/lake -R -Kenv=dev build Analysis:docs
-      
+
       - name: Check for `home_page` folder # this is meant to detect a Jekyll-based website
+        if: github.event_name != 'pull_request'
         id: check_home_page
         run: |
           if [ -d home_page ]; then
@@ -67,6 +69,7 @@ jobs:
           fi
 
       - name: Build blueprint and copy to `home_page/blueprint`
+        if: github.event_name != 'pull_request'
         uses: xu-cheng/texlive-action@v2
         with:
           docker_image: ghcr.io/xu-cheng/texlive-full:20250101
@@ -88,40 +91,46 @@ jobs:
             cp -r blueprint/web home_page/blueprint
 
       - name: Check declarations mentioned in the blueprint exist in Lean code
+        if: github.event_name != 'pull_request'
         run: |
             ~/.elan/bin/lake exe checkdecls blueprint/lean_decls
 
       - name: Copy API documentation to `home_page/docs`
+        if: github.event_name != 'pull_request'
         run: cp -r .lake/build/doc home_page/docs
 
       - name: Remove unnecessary lake files from documentation in `home_page/docs`
+        if: github.event_name != 'pull_request'
         run: |
           find home_page/docs -name "*.trace" -delete
           find home_page/docs -name "*.hash" -delete
 
       - name: Bundle dependencies
+        if: github.event_name != 'pull_request'
         uses: ruby/setup-ruby@v1
         with:
           working-directory: home_page
           ruby-version: "3.0"  # Specify Ruby version
           bundler-cache: true  # Enable caching for bundler
 
       - name: Build website using Jekyll
-        if: env.HOME_PAGE_EXISTS == 'true'
+        if: github.event_name != 'pull_request' && env.HOME_PAGE_EXISTS == 'true'
         working-directory: home_page
         env:
           JEKYLL_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: JEKYLL_ENV=production bundle exec jekyll build  # Note this will also copy the blueprint and API doc into home_page/_site
 
       - name: "Upload website (API documentation, blueprint and any home page)"
+        if: github.event_name != 'pull_request'
         uses: actions/upload-pages-artifact@v3
         with:
           path: ${{ env.HOME_PAGE_EXISTS == 'true' && 'home_page/_site' || 'home_page/' }}
 
       - name: Deploy to GitHub Pages
+        if: github.event_name != 'pull_request'
         id: deployment
         uses: actions/deploy-pages@v4
 
       - name: Make sure the API documentation cache works
+        if: github.event_name != 'pull_request'
         run: mv home_page/docs .lake/build/doc
-