fix: pool helper, dry-run logic, test config, and logger format

Add CI workflow for linting, testing, and Docker image build

Update .gitignore, remove deprecated ffsubsync-job.yaml, and refactor logging and config handling. Add series_filter to config and adjust related tests. Enhance sync logic to support dry run scenarios without file modifications.

Enhance dry run functionality in sync process. Update Config class to include description for dry_run option. Modify main sync logic to handle dry run scenarios without modifying files. Adjust tests to verify dry run behavior and ensure no backups are created during dry runs.

Refactor configuration handling to use CliApp for argument parsing. Update tests to reflect changes in config initialization.

Initial commit

Initial commit