Pass sourceBuildId through variable templates

Author: lbussell

eng/common/templates/variables/dotnet/build-test-publish.yml

@@ -1,7 +1,16 @@
 # Common variables for building/testing/publishing in the .NET team's pipelines
+parameters:
+# sourceBuildId should be overridden when skipping a build to run tests or
+# publish images that were produced in a different pipeline run.
+# Defaults to $(Build.BuildId) which refers to the current pipeline run.
+- name: sourceBuildId
+  type: string
+  default: ""
 
 variables:
 - template: /eng/common/templates/variables/dotnet/common.yml@self
+  parameters:
+    sourceBuildId: ${{ parameters.sourceBuildId }}
 
 - name: commonVersionsImageInfoPath
   value: build-info/docker

eng/common/templates/variables/dotnet/common.yml

@@ -1,5 +1,16 @@
+parameters:
+# sourceBuildId should be overridden when skipping a build to run tests or
+# publish images that were produced in a different pipeline run.
+# Defaults to $(Build.BuildId) which refers to the current pipeline run.
+- name: sourceBuildId
+  type: string
+  default: ""
+
 variables:
 - template: /eng/common/templates/variables/common.yml@self
+  parameters:
+    sourceBuildId: ${{ parameters.sourceBuildId }}
+
 - name: publicProjectName
   value: public
 - name: internalProjectName

eng/pipelines/release-promotion.yml

@@ -8,6 +8,8 @@ resources:
 
 variables:
 - template: /eng/pipelines/variables/core.yml@self
+  parameters:
+    sourceBuildId: "$(resources.pipeline.dotnet-docker-release-staging.runID)"
 # Set pathArgs to empty in order to publish all images
 - name: imageBuilder.pathArgs
   value: ""

eng/pipelines/variables/core.yml

@@ -1,6 +1,16 @@
+parameters:
+# sourceBuildId should be overridden when skipping a build to run tests or
+# publish images that were produced in a different pipeline run.
+# Defaults to $(Build.BuildId) which refers to the current pipeline run.
+- name: sourceBuildId
+  type: string
+  default: ""
+
+
 variables:
 - template: /eng/common/templates/variables/dotnet/build-test-publish.yml@self
-
+  parameters:
+    sourceBuildId: ${{ parameters.sourceBuildId }}
 - name: manifest
   value: manifest.json
 - name: publishEolAnnotations