modules/nixos/buildbot: add pullBased repo microvm.nix

[zowoq]

Didn't start automatically so I triggered an eval manually:

warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
warning: ignoring untrusted substituter 'https://microvm.cachix.org', you are not a trusted user.
Run `man nix.conf` for more information on the `substituters` configuration option.
warning: ignoring the client-specified setting 'trusted-public-keys', because it is a restricted setting and you are not a trusted user
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'
error: worker error: error: flake 'git+file:///var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build' does not provide attribute 'checks'

$ sudo cat /var/lib/buildbot-worker/worker-081/astro_microvm_nix_nix-eval/build/buildbot-nix.toml
attribute = "hydraJobs"

qowoz/microvm.nix@4843601

• seems to ignore buildbot-nix.toml, works after the flake is changed to checks

• eval uses a massive amount of memory

[zowoq]

Suggested change

	"astro/microvm.nix" = {
	url = "https://github.com/qowoz/microvm.nix.git";
	defaultBranch = "main";
	};
	"astro/microvm.nix" = {
	url = "https://github.com/qowoz/microvm.nix.git";
	defaultBranch = "main";
	evalWorkerCount = 4;
	};

@Mic92 Could we make evalWorkerCount configurable per repo? This repo uses a lot of memory and I really don't want to have to reduce it just for one repo.

[Mic92]

@zowoq sounds doable and useful. Please open an issue. We have most of the code needed for this to happen already there.