Shorten error messages to D&K style

See merge request gitlab-org/gitlab-workhorse!377

Replace megacheck with staticcheck

Closes #212

See merge request gitlab-org/gitlab-workhorse!376

Includes some fixes on some files based on suggestion of
`staticcheck`.

Bumps the default go image to 1.11 from 1.10. Still run 1.10
on `test using go 1.10` job.

Prepare for Gitaly absorbing gitlab-shell hooks

Closes #211

See merge request gitlab-org/gitlab-workhorse!374

Filter `sharedSecret` param from Jira

See merge request gitlab-org/gitlab-workhorse!369

Upgrade Gitaly-Proto to protobuf go v1.2 code

See merge request gitlab-org/gitlab-workhorse!368

Helps determine the state of
https://gitlab.com/gitlab-org/gitaly-proto/merge_requests/266

Allow unknown fields in jsonpb gitaly-proto messages

Closes gitlab-ce#57589

See merge request gitlab-org/gitlab-workhorse!367

Change content type detection header size to 4k

See merge request gitlab-org/gitlab-workhorse!366

There is a problem detecting some file types like SVG. Depending
on how the file is built, it will detect the right content type
or not. For example, if the SVG file has a big html comment
(more than 512 bytes) at the beginning of it, when we start
the detection process we'll get the first 512 bytes and based on
that we will set the content type `text/plain`. But this is wrong
because the file is indeed an SVG.

Update gitaly-proto to v1.10.0

See merge request gitlab-org/gitlab-workhorse!364

GitLab 11.8.0 added a new field `glProjectPath` that is erroring out
when generating diffs. We need to keep gitaly-proto in sync with CE/EE
to avoid these issues.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/57589

Adds X-Request-Id response header for Workhorse

See merge request gitlab-org/gitlab-workhorse!363

This change configures workhorse to set the Correlation-ID value in
the response header. This is a common technique which allows errors to
be traced more easily.

This can be done through several methods: 1) users can review their
browser headers and report the value 2) nginx error pages could be
configured to report the correlation-id on the error page, allowing
users to easily report it.

Once the correlation-id has been reported, support engineers or
production staff can use this to further investigate issues using
logging infrastructure, sentry or distributed tracing.

Version 8.3.0

See merge request gitlab-org/gitlab-workhorse!361

Support encoded Content-Disposition fields

Closes #207

See merge request gitlab-org/gitlab-workhorse!360

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24919/diffs adds
support for Rails sending the right `Content-Disposition` header when
there are non-ASCII filenames (e.g. `テスト.txt`). That example file
would render the following Content-Disposition:

```
attachment; filename="テスト.txt", filename*=UTF-8''%E3%83%86%E3%82%B9%E3%83%88.txt
```

Since mime.ParseMediaType appears to strip this header to a canonical
filename, it's not possible to use this to generate the right
Content-Disposition. Instead, we can preserve the existing
Content-Disposition and convert types just by doing a search and replace
(i.e. change `attachment` to `inline` and vice versa when necessary).

Closes https://gitlab.com/gitlab-org/gitlab-workhorse/issues/207

Count ^/-/ requests separately in prometheus

Closes #204

See merge request gitlab-org/gitlab-workhorse!355

Statically link jaeger into Workhorse by default

See merge request gitlab-org/gitlab-workhorse!359

This change will statically compile the jaeger client into workhorse
by default. This will allow support staff to enable the
`GITLAB_TRACING` variable to investigate issues further.

Note that by default, this will not enable tracing, only compile the
client in.

Release v8.2.0

See merge request gitlab-org/gitlab-workhorse!358

Sync master with the recent security release

See merge request gitlab-org/gitlab-workhorse!356

This is a necessary change to solve a security issue. For more details,
see this issue: https://gitlab.com/gitlab-org/gitlab-workhorse/issues/197

Fix SVG recognition to get the proper content type

See merge request gitlab-org/gitlab-workhorse!353

Avoid an ambiguously formattable directive

See merge request gitlab-org/gitlab-workhorse!354

Changelog for 8.1.0

See merge request gitlab-org/gitlab-workhorse!352

Add distributed tracing with LabKit

See merge request gitlab-org/gitlab-workhorse!325

Upgrade the gitaly client

See merge request gitlab-org/gitlab-workhorse!351