fix signing path

Author: Steve Lee (POWERSHELL HE/HIM) (from Dev Box)

.pipelines/DSC-Official.yml

@@ -87,7 +87,7 @@ extends:
           ob_sdl_tsa_configFile: '$(Build.SourcesDirectory)\DSC\.config\tsaoptions.json'
           ob_outputDirectory: '$(Build.ArtifactStagingDirectory)'
           repoRoot: '$(Build.SourcesDirectory)\DSC'
-          signSrcPath: '$(Agent.TempDirectory)\signSrcPath'
+          signSrcPath: '$(Build.SourcesDirectory)\signSrcPath'
           ob_artifactBaseName: 'DSC-$(buildName)'
           ob_sdl_sbom_enabled: true
           ob_signing_setup_enabled: true