Add self-hosted runner CI variant

Author: marcprux

.github/workflows/pull_request.yml

@@ -38,7 +38,22 @@ jobs:
          # build both the quick (x86_64) and complete (aarch64,x86_64,armv7) SDKs
          #arch: ['x86_64', '']
          swift-version: ['swift-6.2-branch', 'development']
-     runs-on: ubuntu-24.04
+         runner: ['ubuntu-24.04']
+         
+       include:
+         # self-hosted runner variant
+         - swift-version: 'development'
+           build-type: 'docker'
+           build-compiler: '1'
+           runner: 'skip-android-runner'
+         - swift-version: 'swift-6.2-branch'
+           build-type: 'local'
+           build-compiler: '0'
+         - swift-version: 'development'
+           build-type: 'local'
+           build-compiler: '0'
+
+     runs-on: ${{ matrix.runner }}
      steps:
       - name: Free Disk Space
         run: |