[#1400] pin CI runner environments for PR and wheel builds

Author: schaubh

.github/workflows/nightly-wheels.yml

@@ -12,11 +12,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os:
-          - macos-latest
-          - ubuntu-latest
-          - ubuntu-22.04-arm
-          - windows-latest
+        os: # keep these platforms in sync with the pull-request.yml file
+          - macos-26
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+          - windows-2025-vs2026
 
     steps:
       - name: Checkout develop
@@ -42,7 +42,7 @@ jobs:
   publish-index:
     name: Publish Nightly Index
     needs: build-wheels
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     permissions:
       contents: write
 

.github/workflows/pre-commit.yml

@@ -4,7 +4,7 @@ on:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/pre-commit

.github/workflows/publish-wheels.yml

@@ -24,9 +24,9 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - macos-latest # ARM64
-          - ubuntu-latest # x86_64
-          - ubuntu-22.04-arm # ARM64
+          - macos-26 # ARM64
+          - ubuntu-24.04 # x86_64
+          - ubuntu-24.04-arm # ARM64
           - windows-2025-vs2026 # x86_64
 
     steps:
@@ -68,7 +68,7 @@ jobs:
 
   make_sdist:
     name: Make SDist
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v5
         with:
@@ -89,7 +89,7 @@ jobs:
   test-sdist:
     name: Test SDist
     needs: make_sdist
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v5
 
@@ -111,7 +111,7 @@ jobs:
   publish:
     name: Publish
     needs: [build-wheels, test-sdist]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     permissions:
       id-token: write
     steps:

.github/workflows/pull-request.yml

@@ -10,13 +10,13 @@ concurrency:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/pre-commit
 
   build-linux:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 90
     needs: pre-commit
     name: Linux (MAX Python)
@@ -67,7 +67,7 @@ jobs:
           if(($LastExitCode -ne 0) -and ($LastExitCode -ne 5)) { exit 1 }
 
   build-macos:
-    runs-on: macos-latest
+    runs-on: macos-26
     timeout-minutes: 90
     needs: pre-commit
     strategy:
@@ -108,7 +108,7 @@ jobs:
         run: ctest -C Release --output-on-failure
 
   docs:
-    runs-on: macos-latest
+    runs-on: macos-26
     steps:
       - uses: actions/checkout@v5
       - uses: ./.github/actions/data-cache

docs/source/Support/bskReleaseNotesSnippets/ci-runner-labels-2026.rst

@@ -0,0 +1 @@
+- Pinned pull request and wheel CI runners to macOS 26, Ubuntu 24.04, and Windows 2025 with Visual Studio 2026.