Add Docker integration tests for TCP and Unix forwarding, pty size,
resize and modes, session env, envknobs, x11 rejection, session
teardown, SessionDuration, policy changes and RuleExpires on active
sessions, Shutdown, host keys and utmp, and run every integrationtest
test in the Dockerfile. Extend the vmtest SSH tests to use real
OpenSSH clients across the tailnet for pty, sftp/scp, agent and port
forwarding, AcceptEnv, ControlMaster, large transfers, banners, user
mapping, revocation, check mode (via a new testcontrol handler),
recording, and the tailscale ssh CLI. Fix make sshintegrationtest,
which only ever tested one image and always exited 0, and trigger the
workflow on go.mod changes and a schedule.
Updates #13038
Updates tailscale/corp#50380
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: Ie4fffad7e9298b6b77c3ec3a6ae81fd784d182ce
Brad Fitzpatrick
467ef0f372