In an normal upload flow, GitLab Rails will move a file to its final
destination and remove the temporary file. Workhorse issues a DELETE a
request to ensure this is cleaned up. Previously this was generating log
noise with every upload. Now only log an error message if there were
some error other than a 404.

Tests: block until grpc server has stopped

Closes #281

See merge request gitlab-org/gitlab-workhorse!576

[ci skip]

Add additional logging for dynamic img resizing

See merge request gitlab-org/gitlab-workhorse!562

Fix semantical merge conflict (double import)

Closes #282

See merge request gitlab-org/gitlab-workhorse!577

Remove ProcessReferences flag

See merge request gitlab-org/gitlab-workhorse!543

Use testify/require in top level tests

See merge request gitlab-org/gitlab-workhorse!570

RAM usage of parsing LSIF references are now back to normalcy and
feature works.

This removes the code in workhorse for determining whether parsing
references is enabled or not. It'll now always be enabled.

Make more use of testify/require

See merge request gitlab-org/gitlab-workhorse!573

Use switch statement instead of long if-else

See merge request gitlab-org/gitlab-workhorse!572

Stop using require.New and assert.New

See merge request gitlab-org/gitlab-workhorse!567

Use more require in internal/{upload,upstream}

See merge request gitlab-org/gitlab-workhorse!571

Tests: consistent helper function names

See merge request gitlab-org/gitlab-workhorse!566

Readme formatting cleanup

See merge request gitlab-org/gitlab-workhorse!548

Fix nil pointer exception when no object storage config is defined

See merge request gitlab-org/gitlab-workhorse!565

This is a regression that was caused if the `[object_storage]` config
section were omitted.

[ci skip]

Resize images on-demand with `gm convert`

See merge request gitlab-org/gitlab-workhorse!546

via graphicsmagick

[ci skip]

Add Azure Blob Storage support

See merge request gitlab-org/gitlab-workhorse!555

This merge request introduces a client for Azure Blob Storage in
Workhorse. Currently customers wanting to use Azure Blob Storage have to
set up a Minio Gateway
(https://docs.gitlab.com/charts/advanced/external-object-storage/azure-minio-gateway.html),
which isn't ideal because it requires customers to maintain their own
proxy server for Azure. We have a number of customers who want native
support for Azure Blob Storage.

Unlike AWS and Google, Azure needs to use an Azure client inside
Workhorse to support direct uploads. Using standard HTTP transfers with
pre-signed URLs with the Azure Put Blob API
(https://docs.microsoft.com/en-us/rest/api/storageservices/put-blob)
doesn't work because Azure doesn't support chunked transfer encoding.
However, Azure does support uploading files in segments via the Put
Block and Put Block List API
(https://docs.microsoft.com/en-us/rest/api/storageservices/put-block),
but this requires an Azure client that can speak this API.

Instead of embedding the Microsoft Azure client directly, we use the Go
Cloud Development Kit (https://godoc.org/gocloud.dev/blob) to make it
easier to add other object storage providers later. For example, GitLab
Rails might return this JSON payload in the
`/internal/uploads/authorize` call:

```json
{
   "UseWorkhorseClient":true,
   "ObjectStorage":{
      "Provider":"AzureRM",
      "GoCloudConfig":{
         "URL":"azblob://test-bucket"
      }
   }
}
```

The `azblob` scheme is managed by the Go Cloud `URLMux`
(https://godoc.org/gocloud.dev/blob#URLMux).

Converting our existing S3 client with Go Cloud should be done later
(https://gitlab.com/gitlab-org/gitlab-workhorse/-/issues/275).

This changes requires
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/38882 to work.

Omnibus configuration changes are in
https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/4505.

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/25877

[ci skip]

Add project level route for conan package uploads

See merge request gitlab-org/gitlab-workhorse!558

Security release process

See merge request gitlab-org/gitlab-workhorse!507