Explicitly triggering release pipelines (#10057)

* Explicit invocation of target pipeline.

Author: agr

.pipelines/Release-trigger.yml

@@ -8,12 +8,32 @@ trigger:
 
 pr: none
 
+parameters:
+- name: TargetPipelines
+  type: object
+  default:
+  - id: 21120
+    paramName: NuGetGallerySubmoduleBranch
+  - id: 21280
+    paramName: NuGetGalleryBranch
+
 variables:
 - name: NugetMultifeedWarnLevel
   value: none
-  
+
 pool:
   vmImage: 'windows-latest'
 
 steps:
-- powershell: Write-Host "Dummy task"
+- ${{ each pipeline in parameters.TargetPipelines }}:
+  - powershell: |-
+      $body = @{
+        "templateParameters" = @{
+          "${{ pipeline.paramName }}" = "$(Build.SourceBranchName)"
+        }
+      }
+      $headers = @{ "Authorization" = "Bearer $env:ACCESS_TOKEN" };
+      $url = "$(System.CollectionUri)$(System.TeamProject)/_apis/pipelines/${{ pipeline.id }}/runs?api-version=7.0"
+      Invoke-RestMethod -Uri $url -Method POST -Headers $headers -Body ($body | ConvertTo-Json) -ContentType "application/json"
+    env:
+      ACCESS_TOKEN: $(System.AccessToken)