Set up self-hosted GitHub Actions runners on Render

Render’s official gha-runner example deploys an ephemeral self-hosted GitHub Actions runner as a Docker-based background worker, enabling CI jobs to access private Render services, databases, internal APIs, and custom toolchains through private networking. Each worker mints a fresh GitHub registration token using a securely stored classic PAT, registers for one job, runs it in a clean environment, deregisters, and repeats; Docker commands are supported through rootless Podman rather than privileged containers. Setup involves forking the example repository, configuring the target repository and compute plan in its Blueprint, deploying it through Render, adding the PAT as a dashboard-only secret, validating the runner and container support, and targeting it in workflows with self-hosted labels. Workers run continuously and incur charges even when idle, while each instance handles only one job at a time, so parallel workloads require additional instances and proportional cost. The guidance also emphasizes PAT rotation, avoiding public repositories and committed secrets, testing graceful shutdown behavior, rerunning Podman checks after plan changes, and using logs and label verification to diagnose registration, queueing, or container-build issues.

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