Merge pull request #187 from TuiSoftware/keep-dockerfile-consistency

use yarn and frozen lock to keep consistency

Dockerfile

@@ -5,11 +5,13 @@ ARG DATABASE_TYPE
 ENV DATABASE_URL "postgresql://umami:umami@db:5432/umami" \
     DATABASE_TYPE=$DATABASE_TYPE
 
-COPY . /app
 WORKDIR /app
-
-RUN npm install && npm run build
-
 EXPOSE 3000
 
-CMD ["npm", "start"]
+COPY package.json yarn.lock /app/
+RUN yarn install --frozen-lockfile
+
+COPY . /app
+RUN yarn build
+
+CMD ["yarn", "start"]