This issue is a blocker at the moment.

@astepano Has there been progress on this issue? Are there workarounds?

There is no way how to specify required memory in official way right now.
Current STI doesn't define any kind of metadata.
We are working on next STI specification to make this possible.

But there is solution.
Current STI is qute flexible.
DesktopQE can define its own inventory file.
Please check: https://pagure.io/standard-test-roles/blob/master/f/scripts

What you need to do:
1. Create inventory file.
2. Copy https://pagure.io/standard-test-roles/blob/master/f/inventory/standard-inventory-qcow2 file to your repo, made necessary changes.
3. Call your script instead of merge-standard-inventory.

https://fedoraproject.org/wiki/CI/Standard_Test_Roles#Inventory

Seems like local only workaround, do you plan to have more RAM in CI or at least have some possibility to pick role with more RAM?

Hi, #219 should add desired functionality.

If you want to test, you can try temporary Copr build from https://copr.fedorainfracloud.org/coprs/g/osci/standard-test-roles/build/766727/

Put in /tests file such as:

cat provision.fmf 
---

# qemu options: https://qemu.weilnetz.de/doc/qemu-doc.html

standard-inventory-qcow2:
  qemu:
    # RAM size in megabytes. Optionally, a suffix of “M” or “G”.
    m: 3G
    net_nic:
      # Use qemu-system-x86_64 -net nic,model=help for a list of available devices.
      model: e1000

standard-inventory-docker:
  dumb_option: dumb_parameter

# vim:ft=yaml: ts=2 sts=2 sw=2 expandtab

I've added basic documentation including the simple example above here:
https://fedoraproject.org/wiki/CI/Metadata#Provision