fix: use npm v8 in expressapp container to workaround slow npm install from github

docker/nodejs/express/.npmrc

@@ -0,0 +1 @@
+package-lock=false

docker/nodejs/express/Dockerfile

@@ -1,8 +1,8 @@
-FROM node:12.18.1
+FROM node:16.15.0
 
 RUN mkdir -p /app
-RUN npm install express
-
-COPY app.js /app
+COPY package.json .npmrc app.js /app/
 
 WORKDIR /app
+RUN npm install
+

docker/nodejs/express/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "expressapp",
+  "version": "1.0.0",
+  "private": true,
+  "main": "app.js",
+  "dependencies": {
+    "express": "*"
+  }
+}