Update ENV_VARIABLES in scripts && Fix some errors

docker/backend/Dockerfile

@@ -5,15 +5,12 @@ COPY . .
 RUN apt-get update
 RUN apt-get install -y build-essential python3 pkg-config
 RUN npm ci --production
-RUN npm i typescript
 RUN npm run build
 
 FROM node:12-buster-slim
 
 WORKDIR /backend
 
-RUN mkdir cache
-
 COPY --from=builder /build/ .
 
 RUN chmod +x /backend/start.sh