ci: Tailscale Github Action integration test - #3351
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The upstream tailscale client only runs its OAuth client-credentials exchange for secrets prefixed tskey-client-, so accept it as an alias for hskey-client-. The prefix is only a label sliced off before lookup, so the same stored client authenticates under either; lets the official client and GitHub Action mint auth keys against headscale.
Registration rejected any --advertise-tags on a pre-auth-key node. The official tailscale client's OAuth authkey flow always re-advertises the key's own tags, so tolerate RequestTags that are a subset of the key's tags and reject only tags the key does not carry.
Stand up a nix-built headscale over self-signed TLS with embedded DERP and a regular node joined via pre-auth, then drive the official tailscale/github-action against it: connect over OAuth (tskey-client-) and an auth key with ping as the success gate, and exercise its hostname, version, tailscaled-args, statedir and args inputs.
…ction The upstream client only runs the OAuth exchange for tskey-client- secrets and reads the control URL from a baseURL attribute, not --login-server. Document the prefix swap, baseURL, and authkey-not-oauth-secret for the GitHub Action.
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This PR sets up integration tests for Tailscale's Github action. It spins up a headscale at the beginning of the job, and then uses the action to connect to it, validating connectivity.