chore(Dockerfile): fix a comment

Author: stakach

Dockerfile

@@ -91,7 +91,7 @@ USER appuser:appuser
 # Spider-gazelle has a built in helper for health checks
 HEALTHCHECK CMD ["/placeos-auth", "-c", "http://127.0.0.1:8080/auth/healthz"]
 
-# Run the app binding on port 3000
+# Run the app binding on port 8080
 EXPOSE 8080
 ENTRYPOINT ["/placeos-auth"]
 CMD ["/placeos-auth", "-b", "0.0.0.0", "-p", "8080"]