ci: publish preview version on pull request

Author: rayriffy

.github/workflows/ci.yml

@@ -25,4 +25,8 @@ jobs:
               run: bun run build
 
             - name: Test
-              run: bun run test
+              run: bun run test
+
+            - name: Publish Preview
+              if: github.event_name == 'pull_request'
+              run: bunx pkg-pr-new publish