Verify Actions checkout before tests

.gitea/workflows/deploy.yml

@@ -19,6 +19,13 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Verify checked-out source
+        run: |
+          pwd
+          test -f public/landing.html
+          test -f public/login.html
+          test -f test/auth.test.js
+
       - name: Test
         run: npm test