Add healthcheck to Docker images

Add HEALTHCHECK instructions to both Dockerfile and Dockerfile.rootless
using the existing /api/healthz endpoint to monitor service health.

Author: seuros

Dockerfile

@@ -46,6 +46,9 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 22 3000
 
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+  CMD curl -f http://localhost:3000/api/healthz || exit 1
+
 RUN apk --no-cache add \
     bash \
     ca-certificates \

Dockerfile.rootless

@@ -44,6 +44,9 @@ LABEL maintainer="[email protected]"
 
 EXPOSE 2222 3000
 
+HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
+  CMD curl -f http://localhost:3000/api/healthz || exit 1
+
 RUN apk --no-cache add \
     bash \
     ca-certificates \