ci(workflow): allow to trigger native builds manually (vercel#50703)

### What?

This PR allows to trigger subset of build-and-deploy workflow manually via gh actions UI.

### Why?

Turbopack time to time requires to validate its changes against all of the platforms we build. Adding manual workflow allows to test it easier.

It tries to guard release check `isRelease` only if it comes from normal event (non manual dispatch) to avoid accidental publish workflow.

.github/workflows/build_and_deploy.yml

@@ -3,6 +3,7 @@ name: build-and-deploy
 on:
   push:
     branches: ['canary']
+  workflow_dispatch:
 
 env:
   NAPI_CLI_VERSION: 2.14.7
@@ -24,7 +25,7 @@ jobs:
     outputs:
       docsChange: ${{ steps.docs-change.outputs.DOCS_CHANGE }}
       codemodChange: ${{ steps.codemod-change.outputs.CODEMOD_CHANGE }}
-      isRelease: ${{ steps.check-release.outputs.IS_RELEASE }}
+      isRelease: ${{ github.event_name != 'workflow_dispatch' && steps.check-release.outputs.IS_RELEASE }}
       swcChange: ${{ steps.swc-change.outputs.SWC_CHANGE }}
       turboToken: ${{ steps.turbo-token.outputs.TURBO_TOKEN }}
       weekNum: ${{ steps.get-week.outputs.WEEK }}