First stab at dokku run Procfile shorthand

tests/unit/30_core_1.bats

@@ -128,6 +128,16 @@ build_nginx_config() {
   assert_success
 }
 
+@test "(core) run command from Procfile" {
+  deploy_app
+  run /bin/bash -c "dokku run $TEST_APP console -c 'echo hi' | tail -n 1"
+  echo "output: "$output
+  echo "status: "$status
+
+  assert_success
+  assert_output "hi"
+}
+
 @test "(core) port exposure (dockerfile raw port)" {
   source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
   cat<<EOF > $DOCKERFILE