chore: add debug logs to release-plz (#356)

Author: makspll

.github/workflows/release-plz.yml

@@ -66,4 +66,5 @@ jobs:
           command: release-pr
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+          CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}
+          RELEASE_PLZ_LOG: DEBUG