CI: Generate vtest.yml matrix on `ubuntu-slim`

This runner image is more lightweight by running inside of a container rather
than a full VM. This is sufficient to run some Python.

diff --git a/.github/workflows/vtest.yml b/.github/workflows/vtest.yml
index 6b8eb80a995c3b8a95748272be9f27e6d5f2702a..4be6dd916e6ff64b43e05d6ccce6acece6a3af09 100644 (file)
--- a/.github/workflows/vtest.yml
+++ b/.github/workflows/vtest.yml
@@ -19,7 +19,7 @@ jobs:
   # generated by .github/matrix.py.
   generate-matrix:
     name: Generate Build Matrix
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-slim
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps: