Run integration tests in demeris-backend PRs

[Pitasi]

Keep in mind the CD pipeline.

When adding new tests, or editing existing tests in demeris-backend, I think it would be easier to have these tests being run automatically in the PR before merging it.

DoD

• add a push trigger to integration tests action, specifying paths that matches .go files
• skip emitting test-pass if the even type is push
• run tests on dev env instead of taking the env value from github.event.client_payload.env