chore(ci): add test for aws s3 assume role

[everpcpc]

• fix: ci: Add integration test for s3 assume role #2690

[PsiACE]

almost lgtm,

cc @Xuanwo how to trigger it in this PR for testing

[everpcpc]

It seems not working as expected: https://github.com/apache/incubator-opendal/actions/runs/6244545530/job/16951629630

test services_s3::test_writer_write ... FAILED

failures:

---- services_s3::test_writer_write ----
Unexpected (temporary) at Writer::write, context: { called: reqsign::LoadCredential, service: s3, path: 7d2ba7eb-47fd-4505-b125-09e70039bb25, write_buf: 5242880 } => loading credential to sign http request, source: source credential is required for AssumeRole, but not found, please check your configuration


failures:
    services_s3::test_writer_write

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 102 filtered out; finished in 15.43s

[Xuanwo]

Thanks a lot!