feat: add pre-commit

- test yamllint
- test ruff linting/formatter
- fix yaml errors

rpms/stalwart/resources/nfpm.yaml

@@ -1,3 +1,4 @@
+---
 # nfpm.yaml
 
 name: ${PACKAGE_NAME}
@@ -44,4 +45,4 @@ scripts:
   preinstall: /app/resources/scripts/preinstall.sh
   postinstall: /app/resources/scripts/postinstall.sh
   preremove: /app/resources/scripts/preremove.sh
-  postremove: /app/resources/scripts/postremove.sh
+  postremove: /app/resources/scripts/postremove.sh