I think that I have enough ram. I get about a third of the way through the build before it fails with

FAILED: out/soong/.intermediates/packages/modules/Virtualization/build/microdroid/microdroid_kernel_signed/android_arm64_armv8-2a_cortex-a55/microdroid_kernel
cp packages/modules/Virtualization/guest/kernel/android15-6.6/arm64/kernel-6.6 out/soong/.intermediates/packages/modules/Virtualization/build/microdroid/microdroid_kernel_signed/android_arm64_armv8-2a_cortex-a55/microdroi>
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/build/out/host/linux-x86/bin/avbtool/__main__.py", line 12, in <module>
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "avbtool.py", line 5037, in <module>
  File "avbtool.py", line 4824, in run
  File "avbtool.py", line 4874, in add_hash_footer
  File "avbtool.py", line 3476, in add_hash_footer
  File "avbtool.py", line 790, in __init__
  File "avbtool.py", line 807, in _read_header
PermissionError: [Errno 13] Permission denied: 'out/soong/.intermediates/packages/modules/Virtualization/build/microdroid/microdroid_kernel_signed/android_arm64_armv8-2a_cortex-a55/microdroid_kernel'

My config is

{
  device = "lynx";
  flavor = "lineageos";
  flavorVersion = "22.2";

  apps.fdroid.enable = true;
  microg.enable = true;
}