fix(doc): adding doc for packaging command

README.md

@@ -11,3 +11,12 @@ Finally create some symbolic link :
  * ln -s /etc/init.d/dockerservice.$SERVICENAME pointing to /etc/init.d/dc. 
 
 Services can now be started/stopped via e.g. /etc/init.d/dockerservice.gitea start.
+
+## Build an Alpine package
+
+You need to install "nfpm" (https://nfpm.goreleaser.com/)
+
+```
+nfpm pkg --packager apk --target .
+
+```