v0.3.0

Upgrade notes

• Upgrading the hub adds the command_runs and command_run_output tables
  to the operational database on start.
• Running commands needs agent v0.3.0 or later. Agents from v0.2.x keep
  working for monitoring and projects, and the dashboard refuses to run
  commands on them.
• The agent refuses to run commands from a config.vpspilot.json that is a
  symlink or writable by its group or others. Ubuntu's default umask creates
  files writable by their group, so run chmod 644 config.vpspilot.json
  on existing configs.

Added

• Run project commands: each command declared in a project's
  config.vpspilot.json gets a Run button on the project page. The hub
  sends only the command's name; the agent reads the file again, runs the
  command as the file's owner in the project directory, and streams its
  output live to the dashboard. Runs can be cancelled.
• Run history: every run is recorded with who started it, the command line,
  the user it ran as, how it ended, its exit code, its duration and its
  output (up to 4 MiB).
• Agent --command-timeout (VPS_PILOT_COMMAND_TIMEOUT): seconds a command
  may run before it is killed. The default is 600.

Changed

• The agent shuts down the same way on SIGTERM as on SIGINT, so a plain
  kill or docker stop also stops the commands it is running.