Another docker try

Dockerfile

@@ -1,8 +1,8 @@
-FROM node: 16-alpine
-RUN mkdir - p / usr / src / app
-WORKDIR / usr / src / app
-COPY. .
+FROM node:16-alpine
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+COPY . .
 RUN npm install
 RUN npm build
 EXPOSE 3000
-CMD["npm", "start"]
+CMD ["npm","start"]