handle timezone correctly in docker build

Dockerfile

@@ -1,6 +1,6 @@
 FROM node:alpine as files 
+ENV TZ="Europe/Berlin"
 WORKDIR /app
-
 COPY [ "package-lock.json", "package.json", "index.ts", "tsconfig.json", "./" ]
 COPY server ./server
 
@@ -18,5 +18,4 @@ RUN npm ci
 FROM dependencies as test
 COPY jest.config.js .
 COPY tests ./tests
-
 RUN npm run test