Add pipeline for testings

[hwakabh]

AsIs

As baseline of unittest have been implemented, no pipeline exists as CI jobs.
For avoiding regressions, the trigger of CI jobs should be push triggers in each PR commit.

ToDo

Add workflows for running unittest with PR commit triggers

(Optional) Acceptance Criteria

Workflow implemented will be passed after pushing commits in topic branches

[hwakabh]

Confirmed jobs have been passed and pytest command have been exited with 0 after make db for creating database dependencies.
https://github.com/hwakabh/random-travelers/actions/runs/7565154112/job/20600442277?pr=56