`getLogrusOutput` & `testRegisterCommandRun` are not being used
anywhere, the usage for these was removed in
https://gitlab.com/gitlab-org/gitlab-runner/merge_requests/1367

Remove support for deprecated distributions

See merge request gitlab-org/gitlab-runner!1130

Minor markdown fixes

Closes #4249

See merge request gitlab-org/gitlab-runner!1382

Added --system flag information into gitlab-runner install command

Closes gitlab-ce#61847

See merge request gitlab-org/gitlab-runner!1378

Remove support for deprecated S3 cache configuration

Closes #4070

See merge request gitlab-org/gitlab-runner!1367

Remove old docker helper image commands

Closes #4013

See merge request gitlab-org/gitlab-runner!1373

Fix support for SELinux volume mounts & case sensitivity

Closes #4269 and #4276

See merge request gitlab-org/gitlab-runner!1381

These bash commands are not longer user by GitLab Runner.

reference #4013

The bash scripts are deprecated and only used when someone specified a
`helper_image` in `[runners.docker]`. In 12.0 we are going to remove any support for the old
bash scripts in favor of the new Go commands.

The new Go commands were introduced for
https://gitlab.com/gitlab-org/gitlab-runner/issues/3755 for the
following merge requests:
- https://gitlab.com/gitlab-org/gitlab-runner/merge_requests/1195
- https://gitlab.com/gitlab-org/gitlab-runner/merge_requests/1201
- https://gitlab.com/gitlab-org/gitlab-runner/merge_requests/1218

Update `TestDockerCommandWithHelperImageConfig` to use one of the latest
image that has the new commands, since the tag that is being used does
not have the new commands which leads into a build failure.

closes https://gitlab.com/gitlab-org/gitlab-runner/issues/4013

Remove support for deprecated entrypoint configuration for K8S

Closes #4073

See merge request gitlab-org/gitlab-runner!1369

The regex does not match the following specification `/src:/dst:Z|z`
which is a legit specification for SELinux
https://docs.docker.com/storage/bind-mounts/#configure-the-selinux-label
both `Z` and `z` mean different things and have a different meaning to
the case sensitivity is important.

closes https://gitlab.com/gitlab-org/gitlab-runner/issues/4276

Add labels to templates

See merge request gitlab-org/gitlab-runner!1375

Both for the volume spec and the setting up the Volume itself the string
is being all lowered case which causes the following issues:

1. When directory has lower/upper case characters
1. When using the Z mode for SELinux https://docs.docker.com/storage/bind-mounts/#configure-the-selinux-label

closes https://gitlab.com/gitlab-org/gitlab-runner/issues/4269

Remove support for deprecated metrics_server setting

Closes #4072

See merge request gitlab-org/gitlab-runner!1368

Remove deprecated git clean strategy

Closes #4175

See merge request gitlab-org/gitlab-runner!1370

Added --system flag information into gitlab-runner install command, the information
contains the default values and a small description of what this flag does in the install
command.

fix gitlab-org/gitlab-ce#61847

Update docs to refer to Windows Batch deprecation

See merge request gitlab-org/gitlab-runner!1371

Update logging key for Docker Machine

Closes #4253

See merge request gitlab-org/gitlab-runner!1361

Limit `docker-windows` to Windows

Closes #4255

See merge request gitlab-org/gitlab-runner!1362

add build info for fedora 30

See merge request gitlab-org/gitlab-runner!1353

Implement session endpoint to proxy build services requests

Closes #3948

See merge request gitlab-org/gitlab-runner!1170

In this commit we add new session endpoint like
`/proxy/buildOrService/port/requestedURI`. Through this endpoint
we will be able to proxy requests to services running
inside each service container.

At the moment only the kubernetes executor implements this
new functionality

Add feature flag to mounting volumes to services

Closes #4260

See merge request gitlab-org/gitlab-runner!1352