ci: gate release job on release-pr output (#11)

* Create release-plz.yml

* ci: configure release-plz auto-release workflow

* ci: allow crates token from env vars fallback

* ci: add release-pr flow and release commit filtering

* ci: gate release job on release-pr output

.github/workflows/release-plz.yml

@@ -7,12 +7,14 @@ on:
   workflow_dispatch:
 
 jobs:
+
   release-plz-release:
     name: release-plz release
     runs-on: ubuntu-latest
     permissions:
       contents: write
     environment: CRATE_RELEASE
+    
     steps:
       - &checkout
         name: Checkout repository