Add favicon and Dockerfile

app.py

@@ -1,4 +1,5 @@
-from flask import Flask, render_template, request, session
+import os
+from flask import Flask, render_template, request, session, send_from_directory
 from flask_bootstrap import Bootstrap
 
 app = Flask(__name__)
@@ -7,6 +8,7 @@ Bootstrap(app)
 
 gesamtwert = 0
 change = 0
+given = 0
 sum = ""
 item1 = 0
 item2 = 0
@@ -17,7 +19,7 @@ item6 = 0
 
 @app.route("/", methods=["GET", "POST"])
 def index():
-    global gesamtwert, item1, item2, item3, item4, item5, item6, sum, givenfloat, change
+    global gesamtwert, item1, item2, item3, item4, item5, item6, sum, givenfloat, change, given
 
     if request.method == "POST":
         # wert = float(request.form["wert"])
@@ -79,5 +81,10 @@ def index():
         item6=session.get('item6', 0),
         )
 
+@app.route('/favicon.ico')
+def favicon():
+    return send_from_directory(os.path.join(app.root_path, 'static'),
+        'favicon.ico', mimetype='image/vnd.microsoft.icon')
+
 if __name__ == "__main__":
-    app.run(debug=True, host="192.168.177.24")
+    app.run(debug=True, host='0.0.0.0')