Make runners configurable via workflow input

Author: Steelskin

.github/workflows/build-toolchain.yml

@@ -36,6 +36,17 @@ on:
         default: true
         required: false
 
+      windows_default_runner:
+        description: 'Build runner'
+        default: 'windows-latest'
+        required: false
+        type: string
+
+      windows_compilers_runner:
+        description: 'Build runner for `compilers` job'
+        type: string
+        required: false
+
   workflow_call:
     inputs:
       swift_version:
@@ -71,6 +82,17 @@ on:
         default: true
         required: false
 
+      windows_default_runner:
+        description: 'Build runner'
+        default: 'windows-latest'
+        required: false
+        type: string
+
+      windows_compilers_runner:
+        description: 'Build runner for `compilers` job'
+        type: string
+        required: false
+
     secrets:
       SYMBOL_SERVER_PAT:
         required: true
@@ -242,8 +264,8 @@ jobs:
             fi
           fi
 
-          echo windows_build_runner=${{ vars.WINDOWS_BUILD_RUNNER || 'windows-latest' }} >> ${GITHUB_OUTPUT}
-          echo compilers_build_runner=${{ vars.COMPILERS_BUILD_RUNNER || vars.WINDOWS_BUILD_RUNNER || 'windows-latest' }} >> ${GITHUB_OUTPUT}
+          echo windows_build_runner=${{ inputs.windows_default_runner }} >> ${GITHUB_OUTPUT}
+          echo compilers_build_runner=${{ inputs.windows_compilers_runner || inputs.windows_default_runner }} >> ${GITHUB_OUTPUT}
 
           echo ANDROID_API_LEVEL=${{ inputs.android_api_level }} >> ${GITHUB_OUTPUT}