fix(docker): supervise Java process in entrypoints instead of tail -f /dev/null (#3051)

Problem: all three docker-entrypoint.sh files used tail -f /dev/null to
keep the container alive. When Java crashed, tail kept running and the
container stayed up with no Java inside — Docker restart policy never fired.

Verified locally: kill -9 Java inside running container -> container
exits -> Docker restarts it automatically (tested 3 times for server,
PD restart loop confirmed for pd).

Author: bitflicker64

hugegraph-pd/hg-pd-dist/docker/docker-entrypoint.sh

@@ -82,5 +82,4 @@ log "  pd.initial-store-list=${HG_PD_INITIAL_STORE_LIST}"
 log "  pd.initial-store-count=${HG_PD_INITIAL_STORE_COUNT}"
 log "  pd.data-path=${HG_PD_DATA_PATH}"
 
-./bin/start-hugegraph-pd.sh -j "${JAVA_OPTS:-}"
-tail -f /dev/null
+./bin/start-hugegraph-pd.sh -d false -j "${JAVA_OPTS:-}"

hugegraph-server/hugegraph-dist/docker/docker-entrypoint.sh

@@ -91,4 +91,9 @@ if [[ "${ACTUAL_BACKEND}" == "hstore" ]]; then
     ./bin/wait-partition.sh || log "WARN: partitions not assigned yet"
 fi
 
-tail -f /dev/null
+PID=$(cat ./bin/pid 2>/dev/null || true)
+if [[ -n "$PID" ]]; then
+    trap 'kill -TERM "$PID" 2>/dev/null; while kill -0 "$PID" 2>/dev/null; do sleep 1; done; exit 0' TERM INT
+    tail --pid="$PID" -f /dev/null
+    exit 1
+fi

hugegraph-store/hg-store-dist/docker/docker-entrypoint.sh

@@ -77,5 +77,4 @@ log "  raft.address=${HG_STORE_RAFT_ADDRESS}"
 log "  server.port=${HG_STORE_REST_PORT}"
 log "  app.data-path=${HG_STORE_DATA_PATH}"
 
-./bin/start-hugegraph-store.sh -j "${JAVA_OPTS:-}"
-tail -f /dev/null
+./bin/start-hugegraph-store.sh -d false -j "${JAVA_OPTS:-}"