GitLab

- requests are cached for 5 min to improve browsing experience when moving backwards

- add short configurable timeout for, e.g. echo commands, or equal

- fix it by calling the correct function

- adds a new alembic recipe to fix the incorrect string length
- add test with long server address

- use clipboard.js to copy ssh public key via button

the temporary file is only used within the task.
so encrypt it with a secret which is only available once during
the execution of the task.