add compose regression to ci

to prevent any regressions, we should be running regression tests using
compose.

Signed-off-by: baude <bbaude@redhat.com>

test/compose/simple_port_map/frontend/app.py

@@ -0,0 +1,9 @@
+from flask import Flask
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+	return "Podman rulez!"
+
+if __name__ == '__main__':
+	app.run(host='0.0.0.0')