Add healthcheck on mercure service (#1306)

Author: maxhelias

symfony/mercure-bundle/0.3/manifest.json

@@ -21,14 +21,20 @@
                 "  image: dunglas/mercure",
                 "  restart: unless-stopped",
                 "  environment:",
-                "    SERVER_NAME: ':80'",
+                "    # Uncomment the following line to disable HTTPS,",
+                "    #SERVER_NAME: ':80'",
                 "    MERCURE_PUBLISHER_JWT_KEY: '!ChangeThisMercureHubJWTSecretKey!'",
                 "    MERCURE_SUBSCRIBER_JWT_KEY: '!ChangeThisMercureHubJWTSecretKey!'",
                 "    # Set the URL of your Symfony project (without trailing slash!) as value of the cors_origins directive",
                 "    MERCURE_EXTRA_DIRECTIVES: |",
                 "      cors_origins http://127.0.0.1:8000",
                 "  # Comment the following line to disable the development mode",
                 "  command: /usr/bin/caddy run --config /etc/caddy/Caddyfile.dev",
+                "  healthcheck:",
+                "    test: [\"CMD\", \"curl\", \"-f\", \"https://localhost/healthz\"]",
+                "    timeout: 5s",
+                "    retries: 5",
+                "    start_period: 60s",
                 "  volumes:",
                 "    - mercure_data:/data",
                 "    - mercure_config:/config"