set NODE_ENV to production for docker builds, avoid installing dev dependencies

Dockerfile

@@ -14,6 +14,7 @@ RUN apt-get update && apt-get install -y locales && rm -rf /var/lib/apt/lists/*
 ENV LANG=en_US.utf8
 ENV NODE_VERSION=v12.20.0
 #ENV NODE_VERSION=v14.15.1
+ENV NODE_ENV=production
 
 # install build deps
 RUN apt-get update && apt-get install -y python make gcc g++
@@ -53,6 +54,7 @@ RUN apt-get update && apt-get install -y locales && rm -rf /var/lib/apt/lists/*
         && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
 
 ENV LANG=en_US.utf8
+ENV NODE_ENV=production
 
 # install node
 #ENV PATH=/usr/local/lib/nodejs/bin:$PATH

package.json

@@ -20,7 +20,6 @@
   "dependencies": {
     "@grpc/proto-loader": "^0.5.6",
     "bunyan": "^1.8.15",
-    "eslint": "^7.20.0",
     "grpc-uds": "^0.1.6",
     "handlebars": "^4.7.7",
     "js-yaml": "^4.0.0",
@@ -32,5 +31,8 @@
     "uuid": "^8.3.2",
     "winston": "^3.3.3",
     "yargs": "^16.2.0"
+  },
+  "devDependencies": {
+    "eslint": "^7.22.0"
   }
 }