Test auto update script in PRs

Author: infinisil

.github/workflows/main.yml

@@ -5,7 +5,7 @@ on:
       - main
 
 jobs:
-  check:
+  build:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -14,3 +14,23 @@ jobs:
 
       - name: build
         run: nix-build -A ci
+
+  test-update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: cachix/install-nix-action@v26
+
+      - name: test update script
+        run: |
+          nix-build -A autoPrUpdate
+          {
+            result/bin/auto-pr-update .
+            echo ""
+            echo '```diff'
+            git diff
+            echo '```'
+          } > $GITHUB_STEP_SUMMARY
+        env:
+          GH_TOKEN: ${{ github.token }}