feat: always initialize git repository

This fixes issues where alternative tools that don't trigger the init via sshcommand - such as git-http-backend - are not able to setup applications correctly.

Note that those apps could always manually trigger git:initialize if desired, but if the app already exists, then this should already _just work_ without that extra initialization.

tests/unit/git_2.bats

@@ -52,7 +52,7 @@ teardown() {
   run /bin/bash -c "test -d $DOKKU_ROOT/$TEST_APP/refs"
   echo "output: $output"
   echo "status: $status"
-  assert_failure
+  assert_success
 
   run /bin/bash -c "dokku git:initialize $TEST_APP"
   echo "output: $output"
@@ -69,7 +69,7 @@ teardown() {
   run /bin/bash -c "test -d $DOKKU_ROOT/$TEST_APP/refs"
   echo "output: $output"
   echo "status: $status"
-  assert_failure
+  assert_success
 
   deploy_app