chore(copier): apply template copier-safe-settings at v1.1.0

* deploy `safe-settings` using the test environment unless deploying
  from the default branch (main/master)
* Note: the tool pulls the settings from the default branch always,
  so this is only a partial improvement in security/safety

Author: dafyddj

.copier-answers.safe-settings.yml

@@ -0,0 +1,3 @@
+# Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
+_commit: v1.1.0
+_src_path: https://github.com/dafyddj/copier-safe-settings

.github/workflows/safe-settings.yml

@@ -15,6 +15,7 @@ jobs:
     permissions:
       contents: read
     runs-on: ubuntu-24.04
+    environment: ${{ github.ref_name == github.event.repository.default_branch && 'production' || 'test' }}
     env:
       # Version/tag of `github/safe-settings` repository to use:
       SAFE_SETTINGS_VERSION: ff7a65655d33006b9820479df0a9e1057a8927e4 # 2.1.17