Private connections for every GitHub Actions runner

The Tailscale GitHub Action has been updated to provide secure connectivity for CI/CD pipelines, now supporting Windows and macOS alongside Linux. This enhancement addresses the previous limitations faced by developers who had to resort to insecure or cumbersome workarounds to connect their pipelines. With the support for all three major operating systems, developers can securely deploy applications to internal servers, debug private test runners via SSH, and connect runners to test databases and internal monitoring tools without exposing them to the public internet. Tailscale's features, such as ephemeral nodes and tags, enhance the security and efficiency of CI/CD pipelines by enabling automatic cleanup of nodes and simplified access control. Setting up Tailscale with GitHub Actions involves creating OAuth clients and secrets, allowing for seamless integration and management of secure connections. This update aims to improve security while easing the workload of Engineering and DevOps teams by providing a unified solution for secure pipeline connectivity.