ci: publish: switch to 'production' environment

Required by configure-aws-credentials to login to AWS.

Author: pillo79

Diff for: .github/workflows/package_core.yml

@@ -159,6 +159,7 @@ jobs:
     needs:
       - package-core
       - test-core
+    environment: production
     permissions:
       id-token: write
       contents: read