fix(ci): pin Linux runners to ubuntu-22.04 for glibc compatibility

ubuntu-latest resolves to 24.04 which links against GLIBC_2.39,
producing native binaries that cannot run on Debian 12 (glibc 2.36).
Ubuntu 22.04 ships glibc 2.35, ensuring compatibility with Debian 12
and other current stable distributions.

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ concurrency:
 
 jobs:
   rust:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       RUSTFLAGS: -C target-cpu=x86-64-v3
     steps:
@@ -40,19 +40,19 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             platform: linux
             arch: x64
             variant: modern
             variant_suffix: "-modern"
             rustflags: "-C target-cpu=x86-64-v3"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             platform: linux
             arch: x64
             variant: baseline
             variant_suffix: "-baseline"
             rustflags: "-C target-cpu=x86-64-v2"
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             platform: linux
             arch: arm64
             variant: ""
@@ -123,7 +123,7 @@ jobs:
           if-no-files-found: error
 
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       RUSTFLAGS: -C target-cpu=x86-64-v3
     steps:
@@ -157,7 +157,7 @@ jobs:
   release:
     if: startsWith(github.ref, 'refs/tags/v')
     needs: [rust, native, test]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     permissions:
       contents: write
       id-token: write