install pkg-config

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

.pipelines/DSC-Official.yml

@@ -329,6 +329,7 @@ extends:
             apt -y install musl-tools
             apt -y install gcc-multilib
             apt -y install libssl-dev
+            apt -y install pkg-config
             rustup default stable-aarch64-unknown-linux-musl
             ./build.ps1 -Release -Architecture aarch64-unknown-linux-musl
             ./build.ps1 -PackageType tgz -Architecture aarch64-unknown-linux-musl -Release