Update Woodpecker CI configuration to use environment variables instead of secrets

.woodpecker.yml

@@ -18,15 +18,13 @@ steps:
       
   release:
     image: plugins/gitea-release
-    secrets: [ gitea_token ]
-    settings:
-      api_key: 
+    environment:
+      PLUGIN_API_KEY:
         from_secret: gitea_token
-      base_url: https://gitea.wpallstars.com
-      files:
-        - plugin-reference-cleaner-*.zip
-      title: "Release ${CI_COMMIT_TAG}"
-      note: "Plugin Reference Cleaner ${CI_COMMIT_TAG}\n\nSee [CHANGELOG.md](https://gitea.wpallstars.com/wpallstars/plugin-reference-cleaner/src/branch/main/CHANGELOG.md) for details."
+      PLUGIN_BASE_URL: https://gitea.wpallstars.com
+      PLUGIN_FILES: plugin-reference-cleaner-*.zip
+      PLUGIN_TITLE: "Release ${CI_COMMIT_TAG}"
+      PLUGIN_NOTE: "Plugin Reference Cleaner ${CI_COMMIT_TAG}\n\nSee [CHANGELOG.md](https://gitea.wpallstars.com/wpallstars/plugin-reference-cleaner/src/branch/main/CHANGELOG.md) for details."
 
 when:
   event: tag