fix: correct paths and healthcheck for libretime/icecast image

- fix config paths from icecast2 to icecast (correct for this image)
- fix mount target to /etc/icecast.xml (not /etc/icecast2/icecast.xml)
- replace wget healthcheck with bash /dev/tcp (wget absent in container)

docker-compose.yml

@@ -9,10 +9,9 @@ services:
     volumes:
       - type: bind
         source: ./config/icecast.xml
-        target: /etc/icecast2/icecast.xml
-        read_only: true
+        target: /etc/icecast.xml
     healthcheck:
-      test: ['CMD-SHELL', 'wget -q -O- http://localhost:8000/status-json.xsl | grep -q icestats']
+      test: ['CMD', 'bash', '-c', 'exec 3<>/dev/tcp/localhost/8000 && printf "GET /status-json.xsl HTTP/1.0\r\nHost: localhost\r\n\r\n" >&3 && grep -q icestats <&3']
       interval: 30s
       timeout: 5s
       retries: 3