Migrate Prometheus alertbot to Matrix

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "kanbot"]
 	path = kanbot
 	url = https://gitea.auro.re/aurore/kanbot
+[submodule "alertbot"]
+	path = alertbot
+	url = https://gitea.auro.re/aurore/alertbot

alertbot

@@ -0,0 +1 @@
+Subproject commit c24d9d6953293906141b4d72f7a60882509e2431

docker-compose.yml

@@ -125,15 +125,17 @@ services:
     ports:
       - 9005:9005
 
+  alertbot:
+    build: alertbot
+    restart: always
+    volumes:
+      - ./alertbot_config/config.yaml:/var/www/alertbot/config.yaml:ro
+
   prometheus-alertmanager:
     build: prometheus-alertmanager
     restart: always
     ports:
       - 9093:9093
-
-  prometheus-alertmanager-discord:
-    build: prometheus-alertmanager-discord
-    restart: always
-    environment:
-      DISCORD_WEBHOOK: "${PROMETHEUS_DISCORD_WEBHOOK}"
+    depends_on:
+      - alertbot
 ...