Revert "Skip Source Build for now (#46190)"

This reverts commit c77deeb.

Author: wtgodbe

.azure/pipelines/ci.yml

@@ -783,20 +783,19 @@ stages:
             publishOnError: true
             includeForks: true
 
-    # Source build - skip until https://github.com/dotnet/source-build/issues/3111 is resolved
-    - ${{ if False }}:
-      - template: /eng/common/templates/job/source-build.yml
-        parameters:
-          platform:
-            name: 'Managed'
-            container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8'
-            buildScript: './eng/build.sh $(_PublishArgs) --no-build-repo-tasks'
-            skipPublishValidation: true
-            jobProperties:
-              timeoutInMinutes: 120
-              variables:
-                # Log environment variables in binary logs to ease debugging
-                MSBUILDLOGALLENVIRONMENTVARIABLES: true
+    # Source build
+    - template: /eng/common/templates/job/source-build.yml
+      parameters:
+        platform:
+          name: 'Managed'
+          container: 'mcr.microsoft.com/dotnet-buildtools/prereqs:centos-stream8'
+          buildScript: './eng/build.sh $(_PublishArgs) --no-build-repo-tasks'
+          skipPublishValidation: true
+          jobProperties:
+            timeoutInMinutes: 120
+            variables:
+              # Log environment variables in binary logs to ease debugging
+              MSBUILDLOGALLENVIRONMENTVARIABLES: true
 
     # Publish to the BAR and perform source indexing. Wait until everything else is done.
     - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}: