Add condition parameter to OneLocBuild (dotnet#7263)

Author: jonfortescue

Documentation/OneLocBuild.md

@@ -77,5 +77,6 @@ The parameters that can be passed to the template are as follows:
 | `LanguageSet` | `VS_Main_Languages` | This defines the `LanguageSet` of the LocProject.json as described in the [OneLocBuild task documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=languageset%2C-languages-(required)). |
 | `LclSource` | `LclFilesInRepo` | This passes the `LclSource` input to the OneLocBuild task as described in [its documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=languageset%2C-languages-(required)). For most repos, this should be set to `LclFilesfromPackage`. |
 | `LclPackageId` | `''` | When `LclSource` is set to `LclFilesfromPackage`, this passes in the package ID as described in the [OneLocBuild task documentation](https://ceapex.visualstudio.com/CEINTL/_wiki/wikis/CEINTL.wiki/107/Localization-with-OneLocBuild-Task?anchor=scenario-2%3A-lcl-files-from-a-package). |
+| `condition` | `''` | Allows for conditionalizing the template's steps on build-time variables. |
 
 It is recommended that you set `LclSource` and `LclPackageId` as shown in the example above.

eng/common/templates/job/onelocbuild.yml

@@ -17,6 +17,7 @@ parameters:
   LclSource: lclFilesInRepo
   LclPackageId: ''
   RepoType: gitHub
+  condition: ''
 
 jobs:
 - job: OneLocBuild
@@ -44,6 +45,7 @@ jobs:
         filePath: $(Build.SourcesDirectory)/eng/common/generate-locproject.ps1
         arguments: $(_GenerateLocProjectArguments)
       displayName: Generate LocProject.json
+      condition: ${{ parameters.condition }}
 
     - task: OneLocBuild@2
       displayName: OneLocBuild
@@ -62,20 +64,20 @@ jobs:
         ${{ if eq(parameters.RepoType, 'gitHub') }}:
           repoType: ${{ parameters.RepoType }}
           gitHubPatVariable: "${{ parameters.GithubPat }}"
-      condition: always()
+      condition: ${{ parameters.condition }}
 
     - task: PublishBuildArtifacts@1
       displayName: Publish Localization Files
       inputs:
         PathtoPublish: '$(Build.ArtifactStagingDirectory)/loc'
         PublishLocation: Container
         ArtifactName: Loc
-      condition: always()
+      condition: ${{ parameters.condition }}
 
     - task: PublishBuildArtifacts@1
       displayName: Publish LocProject.json
       inputs:
         PathtoPublish: '$(Build.SourcesDirectory)/Localize/'
         PublishLocation: Container
         ArtifactName: Loc
-      condition: always()
+      condition: ${{ parameters.condition }}