added surge preview to actions

.github/workflows/build.yml

@@ -1,4 +1,7 @@
-on: [push, pull_request]
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, closed]
+  push:
 jobs:
   web:
     runs-on: ubuntu-latest
@@ -18,6 +21,15 @@ jobs:
       - name: Build
         run: cd web && bundle exec jekyll build
         
+      - name: Preview
+        if: github.event_name == 'pull_request'
+        uses: afc163/surge-preview@v1
+        with:
+          surge_token: ${{ secrets.SURGE_TOKEN }}
+          dist: web/_site
+          teardown: true
+          build: echo # see https://github.com/afc163/surge-preview/issues/231
+      
       # this is a beautiful way to deploy a website and i will not take any criticism
       - name: Deploy
         if: github.event_name == 'push' && github.ref_name == 'main'
@@ -41,6 +53,15 @@ jobs:
       - name: Build
         run: cd docs && dotnet tool restore && dotnet docfx
         
+      - name: Preview
+        if: github.event_name == 'pull_request'
+        uses: afc163/surge-preview@v1
+        with:
+          surge_token: ${{ secrets.SURGE_TOKEN }}
+          dist: docs/_site
+          teardown: true
+          build: echo # see https://github.com/afc163/surge-preview/issues/231
+      
       # this is a beautiful way to deploy a website and i will not take any criticism
       - name: Deploy
         if: github.event_name == 'push' && github.ref_name == 'main'