add auto-update service

[casperdcl]

add auto-update (watchtower) service

• update installation script, usage: ./install.sh premai-io main main autoupdate
• replaces/closes docker auto-update prem-research/app#458
• replaces/closes Check update and trigger update prem-daemon#121

[tiero]

I assume this services checks the latest tag for each docker service. This will be a huge change as we treat the versions.json as the central point for all the services to lock down their versions as the "stable" combination.

The question is (and reason for building one from scratch) it possible to programatically source the latest versions to the watchtower service?

[casperdcl]

yes gewd point.

This PR would ignore versions.json, and instead use one tag (:latest) for premapp, premd, dnsd, authd, controllerd.

Note we could create a different tagging convention instead (v1, stable, etc).

AFAIK there's no way to configure watchtower to parse semver tags (i.e. to only pick major/minor/patch version updates)

[nsosio]

LGTM :)

[filopedraz]

LGTM, but I let @tiero decide if we can merge it.

[tiero]

Let's postpone it as enhancement after the announcement, as it involves changing something we already depend on and I am afraid many places assume versions.json as source of truth

[casperdcl]

it involves changing something we already depend on

not really, auto-update is disabled by default.