fix: reduce ARM runner size from 8vcpu to 4vcpu for ephemeral builds

jfroche · jfroche · commit 21a9736600f6 · 2025-11-14T15:39:38.000+01:00
We might not need the full 8vcpu for aarch64-linux builds, so this
change reduces the runner size to 4vcpu to wait less for available
blacksmith runners.
diff --git a/nix/packages/github-matrix/github_matrix.py b/nix/packages/github-matrix/github_matrix.py
@@ -59,7 +59,7 @@ class GitHubActionPackage(TypedDict):
 BUILD_RUNNER_MAP: Dict[RunnerType, Dict[System, RunsOnConfig]] = {
     "ephemeral": {
         "aarch64-linux": {
-            "labels": ["blacksmith-8vcpu-ubuntu-2404-arm"],
+            "labels": ["blacksmith-4vcpu-ubuntu-2404-arm"],
         },
         "x86_64-linux": {
             "labels": ["blacksmith-8vcpu-ubuntu-2404"],
diff --git a/nix/packages/github-matrix/tests/test_github_matrix.py b/nix/packages/github-matrix/tests/test_github_matrix.py
@@ -182,7 +182,7 @@ def test_default_aarch64_linux(self):
             "system": "aarch64-linux",
         }
         result = get_runner_for_package(pkg)
-        assert result == {"labels": ["blacksmith-8vcpu-ubuntu-2404-arm"]}
+        assert result == {"labels": ["blacksmith-4vcpu-ubuntu-2404-arm"]}
 
 
 class TestSortPkgsByClosures:

Original file line number	Diff line number	Diff line change
`@@ -182,7 +182,7 @@ def test_default_aarch64_linux(self):`
`182`	`182`	`"system": "aarch64-linux",`
`183`	`183`	`}`
`184`	`184`	`result = get_runner_for_package(pkg)`
`185`		`- assert result == {"labels": ["blacksmith-8vcpu-ubuntu-2404-arm"]}`
	`185`	`+ assert result == {"labels": ["blacksmith-4vcpu-ubuntu-2404-arm"]}`
`186`	`186`
`187`	`187`
`188`	`188`	`class TestSortPkgsByClosures:`