feat: Adds healthcheck to web server

docker-compose.yml

@@ -33,6 +33,14 @@ services:
     depends_on:
       data_handler:
         condition: service_started
+    # all the way zoomed out, with hamburg at the center, at least one camera should be returned
+    healthcheck:
+      test: >
+        ["CMD", "curl -s 'http://localhost/camera.php?bbox=-92.52991540527346,30.683278176916133,131.7689595947266,72.87186315234298&zoom=4&width=2552&height=867' | grep '^\[.+\]$'"]
+      interval: 10s
+      timeout: 5s
+      start_period: 30s
+      retries: 5
   
   data_handler:
     image: git.hamburg.ccc.de/ccchh/sunders/data_handler:latest