In other integration test servers, they have endpoints for proguard-artifact-releases:

• https://github.com/getsentry/sentry-maven-plugin/blob/c2403b7113af5351d732308b24b2016dba0a4714/test/integration-test-server.py#L45
• https://github.com/getsentry/sentry-android-gradle-plugin/blob/5e15a33821ffe42aaa86a2a9311738f01a943820/test/integration-test-server.py#L45

But sentry-server in this repo does not support it.