feat: add Berlin timezone support to containers

- Add tzdata package to Dockerfile runner stage
- Set TZ=Europe/Berlin in docker-compose.yml for both trading-bot and postgres
- All container timestamps now show CET instead of UTC
- User-friendly log times matching local time

Files changed:
- Dockerfile: Added tzdata to runner stage
- docker-compose.yml: Added TZ environment variable

Dockerfile

@@ -58,8 +58,8 @@ RUN npm run build
 # ================================
 FROM node:20-alpine AS runner
 
-# Install dumb-init for proper signal handling and Docker CLI for restart capability
+# Install dumb-init for proper signal handling, Docker CLI for restart capability, and tzdata for timezone support
-RUN apk add --no-cache dumb-init docker-cli
+RUN apk add --no-cache dumb-init docker-cli tzdata
 
 WORKDIR /app
 

docker-compose.yml

@@ -17,6 +17,9 @@ services:
     ports:
       - "3001:3000"
     environment:
+      # Timezone
+      TZ: Europe/Berlin
+      
       # Node environment
       NODE_ENV: production
       PORT: 3000
@@ -96,6 +99,7 @@ services:
     ports:
       - "5432:5432"
     environment:
+      TZ: Europe/Berlin
       POSTGRES_DB: trading_bot_v4
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}