Add Alpine leg based on MS SDK for VMR (#17769)

eng/pipelines/templates/stages/vmr-build.yml

@@ -130,6 +130,25 @@ stages:
 
   - ${{ if eq(parameters.isLiteBuild, false) }}:
 
+    - template: ../jobs/vmr-build.yml
+      parameters:
+        # Changing the build name requires updating the referenced name in the source-build-sdk-diff-tests.yml pipeline
+        buildName: Alpine317_Online_MsftSdk
+        isBuiltFromVmr: ${{ parameters.isBuiltFromVmr }}
+        vmrBranch: ${{ variables.VmrBranch }}
+        architecture: x64
+        artifactsRid: alpine.3.17-x64
+        pool:
+          name: ${{ variables.defaultPoolName }}
+          demands: ${{ variables.defaultPoolDemands }}
+        container: ${{ parameters.alpine317Container }}
+        buildFromArchive: false            # 🚫
+        enablePoison: false                # 🚫
+        excludeOmniSharpTests: true        # ✅
+        runOnline: true                    # ✅
+        useMonoRuntime: false              # 🚫
+        withPreviousSDK: false             # 🚫
+
     - template: ../jobs/vmr-build.yml
       parameters:
         # Changing the build name requires updating the referenced name in the source-build-sdk-diff-tests.yml pipeline