Pin Linux CI runners to ubuntu-24.04

GitHub is moving the ubuntu-latest label to the Ubuntu 26 image between
2026-10-19 and 2026-11-19. Several jobs depend on the exact image (apt
package names, the desktop session, and the font metrics behind the
fidelity screenshot baselines), so pin to 24.04 until 26 is validated.

Matrix values and the starter-canary artifact name that is derived from
matrix.os are renamed together so the report lookup keeps matching.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: shai-almog

.github/workflows/admob-android-runtime-check.yml

@@ -21,7 +21,7 @@ concurrency:
 
 jobs:
   banner-measurement:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     timeout-minutes: 20
     steps:
       - uses: actions/checkout@v6

.github/workflows/ai-cn1lib-android-check.yml

@@ -22,7 +22,7 @@ on:
 
 jobs:
   android-native-check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6
       - name: Set up JDK 17

.github/workflows/ant.yml

@@ -23,7 +23,7 @@ concurrency:
 jobs:
   build-linux-jdk8:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     timeout-minutes: 45
 
     steps:

.github/workflows/archetype-smoke.yml

@@ -48,7 +48,7 @@ concurrency:
 
 jobs:
   archetype-smoke:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@v6

.github/workflows/blog-prose.yml

@@ -34,7 +34,7 @@ jobs:
   gate:
     name: Blog prose gate
     if: github.event_name == 'pull_request'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Check out repository
         uses: actions/checkout@v6
@@ -202,7 +202,7 @@ jobs:
   # --------------------------------------------------------------------------- #
   report:
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Check out repository
         uses: actions/checkout@v6

.github/workflows/blog-syndication.yml

@@ -22,7 +22,7 @@ concurrency:
 
 jobs:
   syndicate:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Check out repository
         uses: actions/checkout@v6

.github/workflows/build-container.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
   build-and-push:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     permissions:
       contents: read
       packages: write

.github/workflows/car-android.yml

@@ -56,7 +56,7 @@ jobs:
     name: Car Android Auto
     permissions:
       contents: read
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     timeout-minutes: 60
     env:
       GITHUB_TOKEN: ${{ secrets.CN1SS_GH_TOKEN }}

.github/workflows/check-16k-page-alignment.yml

@@ -29,7 +29,7 @@ on:
 
 jobs:
   check-16k-page-alignment:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6
 

.github/workflows/check-control-characters.yml

@@ -24,7 +24,7 @@ on:
 
 jobs:
   check-control-characters:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6