Stabilize U

devops/docker/healthcheck.sh

@@ -8,10 +8,19 @@ USER_AGENT="stellaops-healthcheck"
 
 fetch() {
   target_path="$1"
-  # BusyBox wget is available in Alpine; curl not assumed.
-  wget -qO- "http://${HOST}:${PORT}${target_path}" \
-    --header="User-Agent: ${USER_AGENT}" \
-    --timeout="${HEALTH_TIMEOUT:-4}" >/dev/null
+  url="http://${HOST}:${PORT}${target_path}"
+  if command -v curl >/dev/null 2>&1; then
+    curl -sf --max-time "${HEALTH_TIMEOUT:-4}" \
+      -H "User-Agent: ${USER_AGENT}" \
+      "$url" >/dev/null
+  elif command -v wget >/dev/null 2>&1; then
+    wget -qO- "$url" \
+      --header="User-Agent: ${USER_AGENT}" \
+      --timeout="${HEALTH_TIMEOUT:-4}" >/dev/null
+  else
+    # Fallback: bash /dev/tcp (liveness only, no HTTP headers)
+    exec 3<>"/dev/tcp/${HOST}/${PORT}" && exec 3>&-
+  fi
 }
 
 fail=0