Add gunicorn production server

app/gunicorn.conf.py

@@ -0,0 +1,4 @@
+from os import environ
+
+# https://docs.gunicorn.org/en/stable/settings.html#settings
+bind = f"0.0.0.0:{environ.get('PORT', 5000)}"

app/portable.py

@@ -260,4 +260,5 @@ def get_article(path):
         return "Invalid URL", 400
 
 
-app.run(host="0.0.0.0", port=5000, debug=False)
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000, debug=False)

app/requirements.txt

@@ -1,3 +1,4 @@
-flask
-requests
 bs4
+flask
+gunicorn
+requests