git.hammerle.me: always push via ssh

similar to commit 9a5981bf3e17aa65ec805b94fe92d83f232bae16

https://git-scm.com/docs/git-config#Documentation/git-config.txt-urlltbasegtpushInsteadOf

gitconfig

@@ -62,6 +62,9 @@
 [push]
 	default = current
 
+[url "git@git.hammerle.me:"]
+	pushInsteadOf = https://git.hammerle.me/
+
 [url "git@github.com:"]
 	pushInsteadOf = https://github.com/