Change the format of the silverpeas manifest file to the new one

library/silverpeas

@@ -1,4 +1,7 @@
-# maintainer: Miguel Moquillon <[email protected]> (@mmoqui)
+Maintainers: Miguel Moquillon <[email protected]> (@mmoqui)
+
+GitRepo: https://github.com/Silverpeas/docker-silverpeas-prod.git
+
+Tags: 6.0-alpha1
+GitCommit: b87b3bb7e28e61cd9d76262e897451e2b466d265
 
-latest: git://github.com/Silverpeas/docker-silverpeas-prod@b87b3bb7e28e61cd9d76262e897451e2b466d265
-6.0-alpha1: git://github.com/Silverpeas/docker-silverpeas-prod@b87b3bb7e28e61cd9d76262e897451e2b466d265