- change IMAGE_NAME from server-verwaltung to fleetledger for consistency
📝 docs(README): translate and update README content
- translate README content from German to English
- update sections for quickstart, environment variables, and security notes
- add detailed instructions for using Docker and Docker Compose
- create workflow to build and push Docker images on push to main or tags
- configure Docker Buildx and login to GitHub Container Registry
- use secrets for secure authentication
- tag images with latest and commit SHA for versioning