feat: add verify_app_name calls to all shell subcommands

Without this, folks could potentially run commands against invalid applications.

plugins/git/subcommands/initialize

@@ -10,7 +10,7 @@ cmd-git-initialize() {
   [[ "$1" == "$cmd" ]] && shift 1
   declare APP="$1"
 
-  is_valid_app_name "$APP"
+  verify_app_name "$APP"
   dokku_log_info1_quiet "Initializing git repository for $APP"
   fn-git-create-hook "$APP"
 }

plugins/git/subcommands/set

@@ -10,8 +10,8 @@ cmd-git-set() {
   [[ "$1" == "$cmd" ]] && shift 1
   declare APP="$1" KEY="$2" VALUE="$3"
   local VALID_KEYS=("deploy-branch" "keep-git-dir" "rev-env-var")
+  verify_app_name "$APP"
 
-  [[ -z "$APP" ]] && dokku_log_fail "Please specify an app to run the command on"
   [[ -z "$KEY" ]] && dokku_log_fail "No key specified"
 
   if ! fn-in-array "$KEY" "${VALID_KEYS[@]}"; then