ci: test on macOS 12 like libgit2 does

There seems to be some issue with Homebrew's ninja install on the newer versions so let's stick to whatever libgit2 is testing with.
libgit2 · Sep 25, 2024 · 08f538f · 08f538f
1 parent eb43402
commit 08f538f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
-        os: [ macOS-latest ]
+        os: [ macOS-12 ]
     runs-on: ${{ matrix.os }}
 
     name: Ruby ${{ matrix.ruby }} on ${{ matrix.os }}