Switch to using a url_template and attribution in config

config-sample.yml

@@ -1,5 +1,6 @@
-stadiamaps:
+osm:
-  api_key: 
+  url_template: https://tile.openstreetmap.org/{z}/{x}/{y}.png
+  attribution: © OpenStreetMap
 nominatim:
   api_base_url: 
 mastodon:

scl.py

@@ -27,7 +27,8 @@ except requests.JSONDecodeError:
     raise
 
 config = yaml.safe_load(open("config.yml"))
-stadiamaps_api_key = config["stadiamaps"]["api_key"]
+osm_url_template = config["osm"]["url_template"]
+osm_attribution = config["osm"]["attribution"]
 nominatim_url = config["nominatim"]["api_base_url"]
 mastodon_client = Mastodon(
     client_id=config["mastodon"]["client_id"],
@@ -39,7 +40,7 @@ mastodon_client = Mastodon(
 
 class AttribStaticMap(staticmap.StaticMap, object):
     def __init__(self, *args, **kwargs):
-        self.attribution = "© Stadia Maps © OpenMapTiles © OpenStreetMap"
+        self.attribution = osm_attribution
         super(AttribStaticMap, self).__init__(*args, **kwargs)
 
     def _draw_features(self, image):
@@ -132,8 +133,7 @@ def do_initial_post(
         map = AttribStaticMap(
             1024,
             1024,
-            url_template="https://tiles.stadiamaps.com/tiles/outdoors/{z}/{x}/{y}@2x.png?api_key="
+            url_template=osm_url_template,
-            + stadiamaps_api_key,
             tile_size=512,
         )
         assert event["polygons"]["type"] == "polygon"