fix: Use env custom file if it exists for tests

[hubertdeng123]

Tests in relay/snuba likely weren't being properly run with the pre-submit images that were built. This led to an event today where a change led to self-hosted e2e test breakage in relay on master that was not caught on the PR. I believe this should fix that issue. I suspect the custom env file for every commit on a PR wasn't being used for e2e tests that is built here: https://github.com/getsentry/action-self-hosted-e2e-tests/blob/main/action.yml#L64

[codecov]

Test Failures Detected: Due to failing tests, we cannot provide coverage reports at this time.

❌ Failed Test Results:

Completed 10 tests with 1 failed, 9 passed and 0 skipped.

View the full list of failed tests

Test Description

Failure message

Testsuite: pytest Test name: _integration-test.test_run::test_receive_transaction_events Envs: - default

client_login = (<httpx.Client object at 0x7f918c6b8850>, <Response [200 OK]>) #x1B[0m#x1B[94mdef#x1B[39;49;00m #x1B[92mtest_receive_transaction_events#x1B[39;49;00m(client_login): client, _ = client_login #x1B[94mwith#x1B[39;49;00m sentry_sdk.init( dsn=get_sentry_dsn(client), profiles_sample_rate=#x1B[94m1.0#x1B[39;49;00m, traces_sample_rate=#x1B[94m1.0#x1B[39;49;00m ): #x1B[94mdef#x1B[39;49;00m #x1B[92mplaceholder_fn#x1B[39;49;00m(): #x1B[96msum#x1B[39;49;00m = #x1B[94m0#x1B[39;49;00m #x1B[94mfor#x1B[39;49;00m i #x1B[95min#x1B[39;49;00m #x1B[96mrange#x1B[39;49;00m(#x1B[94m5#x1B[39;49;00m): #x1B[96msum#x1B[39;49;00m += i time.sleep(#x1B[94m0.25#x1B[39;49;00m) #x1B[94mwith#x1B[39;49;00m sentry_sdk.start_transaction(op=#x1B[33m"#x1B[39;49;00m#x1B[33mtask#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m, name=#x1B[33m"#x1B[39;49;00m#x1B[33mTest Transactions#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m): placeholder_fn() poll_for_response( #x1B[33mf#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m#x1B[33m{#x1B[39;49;00mSENTRY_TEST_HOST#x1B[33m}#x1B[39;49;00m#x1B[.../organizations/sentry/events/&dataset=profiles&field=profile.id&project=1&statsPeriod=1h#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m, client, #x1B[94mlambda#x1B[39;49;00m x: #x1B[96mlen#x1B[39;49;00m(json.loads(x)[#x1B[33m"#x1B[39;49;00m#x1B[33mdata#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m]) > #x1B[94m0#x1B[39;49;00m, ) > poll_for_response( #x1B[33mf#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m#x1B[33m{#x1B[39;49;00mSENTRY_TEST_HOST#x1B[33m}#x1B[39;49;00m#x1B[.../organizations/sentry/events/&dataset=spansIndexed&field=id&project=1&statsPeriod=1h#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m, client, #x1B[94mlambda#x1B[39;49;00m x: #x1B[96mlen#x1B[39;49;00m(json.loads(x)[#x1B[33m"#x1B[39;49;00m#x1B[33mdata#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m]) > #x1B[94m0#x1B[39;49;00m, ) #x1B[1m#x1B[31m_integration-test/test_run.py#x1B[0m:381: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ request = 'http://localhost:.../organizations/sentry/events/&dataset=spansIndexed&field=id&project=1&statsPeriod=1h' client = <httpx.Client object at 0x7f918c6b8850> validator = <function test_receive_transaction_events.<locals>.<lambda> at 0x7f918c53ff40> #x1B[0m#x1B[94mdef#x1B[39;49;00m #x1B[92mpoll_for_response#x1B[39;49;00m( request: #x1B[96mstr#x1B[39;49;00m, client: httpx.Client, validator: Callable = #x1B[94mNone#x1B[39;49;00m ) -> httpx.Response: #x1B[94mfor#x1B[39;49;00m i #x1B[95min#x1B[39;49;00m #x1B[96mrange#x1B[39;49;00m(TIMEOUT_SECONDS): response = client.get( request, follow_redirects=#x1B[94mTrue#x1B[39;49;00m, headers={#x1B[33m"#x1B[39;49;00m#x1B[33mReferer#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m: SENTRY_TEST_HOST} ) #x1B[94mif#x1B[39;49;00m response.status_code == #x1B[94m200#x1B[39;49;00m: #x1B[94mif#x1B[39;49;00m validator #x1B[95mis#x1B[39;49;00m #x1B[94mNone#x1B[39;49;00m #x1B[95mor#x1B[39;49;00m validator(response.text): #x1B[94mbreak#x1B[39;49;00m time.sleep(#x1B[94m1#x1B[39;49;00m) #x1B[94melse#x1B[39;49;00m: > #x1B[94mraise#x1B[39;49;00m #x1B[96mAssertionError#x1B[39;49;00m( #x1B[33m"#x1B[39;49;00m#x1B[33mtimeout waiting for response status code 200 or valid data#x1B[39;49;00m#x1B[33m"#x1B[39;49;00m ) #x1B[1m#x1B[31mE AssertionError: timeout waiting for response status code 200 or valid data#x1B[0m #x1B[1m#x1B[31m_integration-test/test_run.py#x1B[0m:40: AssertionError

[hubertdeng123]

CI failing as it is waiting for #3092