update docker images to use node:lts

dashboard/docker/dev.Dockerfile

@@ -1,6 +1,6 @@
 # Development environment
 # -----------------------
-FROM node:latest
+FROM node:lts
 WORKDIR /webpack
 
 COPY package*.json ./

docker/Dockerfile

@@ -37,7 +37,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
 
 # Webpack build environment
 # -------------------------
-FROM node:latest as build-webpack
+FROM node:lts as build-webpack
 WORKDIR /webpack
 
 COPY ./dashboard ./

ee/docker/ee.Dockerfile

@@ -38,7 +38,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
 
 # Webpack build environment
 # -------------------------
-FROM node:latest as build-webpack
+FROM node:lts as build-webpack
 WORKDIR /webpack
 
 COPY ./dashboard ./