Your team runs an Azure Pipelines YAML build that compiles a large C++ codebase. Builds currently use Microsoft-hosted agents and consistently take 55 minutes, largely because the toolchain and third-party SDKs must be downloaded and installed at the start of every run. The organization already owns powerful on-premises Linux servers that sit mostly idle, and the build must access an internal artifact server that is not exposed to the public internet. You need to reduce build time and cost while satisfying the network requirement. What should you do?