[BUG] action fails on runner that doesn't have sqlite3 installed

## Describe the bug

Restoration (specifically the merge step) fails on a runner that does not have sqlite3 installed.

Another issue is that USER variable is also not defined, but that fix was easy:

```sh
export USER=$(id -un)
```

## To Reproduce

1. Run on a linux runner that doesn't have sqlite3 installed

## Expected behavior

Restore supposed to work and not crash with code 127.
