Add more tests of workouts.js and api.js. Add --coverage to jest. Add export to workouts and api.js to be able to get coverage reports.

Update frontend test dockerfile to use docker image v4 which supports both AMD64 and ARM64 architectures.

Refactor workouts.js to use filterWorkouts function combining search, exercise types and visibilty types. Add filter by exercise type.

Add api.js, move fetchWorkouts and fetchExerciseTypes to api.js. Add code to get exercise filter options.

implemented tests for all permissions except IsCoachOfWorkoutAndVisibleToCoach, don't quite understand the permission

Add .env.dev file with localhost domain. Set domain to localhost in .env. Use local .env file on prod server.

Add tests to check if workouts are rendered and search hides correct workouts. Change workouts.js to be more testable.