This reverts merge request !4030

Signed-off-by: NRémy Coutable <remy@rymai.me>

Update build triggers API documentation
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* Ensure updated/deleted timestamps are consistent

The user API documentation and the actual implementation were out of sync, missing certain newly introduced fields and beeing inconsistent between certain API definitions. The documentation was changed according the actual latest implementation.
Signed-off-by: NFabio Huser <fabio@fh1.ch>

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These would end up being rendered as:

    <a href="...">@yorickpeterse</a>
    <a href="...">@yorickpeterse</a>

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Fixes gitlab-org/gitlab-ce#15254 gitlab-org/gitlab-ce#14277

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- Parameter validation as ISO8601 format

Add explicit --with statement for postgres and mysql gem groups as necessary. When I followed these instructions, the first command did not install the postgres group and it had to be made explicit.

These changes were pulled from GitLab EE to support configuring
an alternative API URL than the default https://api.github.com.
In addition, the `verify_ssl` flag allows users to disable SSL cert
checking.

One modification: add a default `args` option if it does not exist
to avoid breaking existing configurations.

fix: in recent versions of Docker, the /.dockerinit file doesn't exist; use /.dockerenv instead [ci skip]
Signed-off-by: NJason Roehm <jasonr@3db-labs.com>

This reverts merge request !3839

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Signed-off-by: NRémy Coutable <remy@rymai.me>

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This setup is quite a bit different from before. In the previous setup
raw data was kept around for 30 days and downsampled data for 7 days.
This became problematic for GitLab.com as the number of points and
series resulted in InfluxDB running out of memory when starting up
(besides taking up 30 GB of storage).

To work around this the new setup keeps raw data around for _only_ an
hour while keeping downsampled data around for 7 days. In turn all
Grafana dashboards _only_ query the downsampled data instead of also
querying raw data.

Based on rough calculations this setup needs around 2GB of storage for 1
week of data, excluding whatever is needed for storing the raw data
(this highly depends on the amount of traffic).

If users want to use this new setup they have to remove any existing
dashboards provided by GitLab.com and re-import the ones from the
Grafana dashboards repository
(https://gitlab.com/gitlab-org/grafana-dashboards/). Should users wish
to change their default retention policy the easiest way of doing so is
to simply drop the database and re-run the InfluxDB commands added by
this commit. Users who want to keep their default retention policy as-is
can simply create the "downsampled" policy and run the other commands.

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Closes #15525