Add a functional test

Run it in parallel

brigade.js

@@ -1,11 +1,20 @@
-const { events, Job } = require("brigadier")
+const { events, Job, Group } = require("brigadier")
 
 events.on("pull_request", () => {
-    var job = new Job("pycodestyle", "python:alpine")
-    job.tasks = [
+    var style = new Job("pycodestyle", "python:alpine")
+    style.tasks = [
       "pip install pycodestyle",
-      "cd /src",
-      "pycodestyle demoapp"
+      "pycodestyle -v /src/demoapp"
     ]
-    job.run()
+
+    var functional = new Job("functional", "python:alpine")
+    functional.tasks = [
+      "apk update && apk add curl",
+      "pip install /src/",
+      "/usr/local/bin/demoapp &",
+      "sleep 2",
+      "curl http://127.0.0.1:8000"
+    ]
+
+    Group.runEach([style, functional])
 })