docs: add openAPI spec, add nix-shell
#111
Run and billable time
Learn about OS pricing on GitHub Actions| Job | Run time | Billable time |
|---|---|---|
| 1m 45s | 0s | |
| 1m 45s | 0s |
nix-shell
#111
| Job | Run time | Billable time |
|---|---|---|
| 1m 45s | 0s | |
| 1m 45s | 0s |