Attempting to get local and remote repos back in sync

Dockerfile

@@ -5,17 +5,25 @@ WORKDIR /usr/src/app
 
 # Install app dependencies
 COPY package*.json ./
-COPY .npmrc ./.npmrc
-RUN npm install
+COPY .npmrc ./
+COPY yarn.lock ./
+RUN yarn install --frozen-lockfile
 
 # Build and test
 COPY tsconfig.json ./
 COPY ./src ./src
-RUN npm run build --if-present
+COPY gulpfile.mjs ./
+RUN yarn build
 RUN npm run test --if-present
 
 # Remove source files
 RUN rm -r ./src
 
-EXPOSE 3000
-CMD [ "npm", "start" ]
+ARG DOMAIN=example.com
+ENV DOMAIN=$DOMAIN
+
+ARG PORT=3000
+ENV PORT=$PORT
+
+EXPOSE $PORT
+CMD [ "yarn", "start" ]