gpgv: can't allocate lock for '/home/runner/.gnupg/aptlytest.gpg'
this forced running local system tessts in /home/runner, as it is
in the gitgub actions.
- use s3 mirror instead of internet download
- reduce download verbosity
- do not use venv in docker-system-tests
- be more verbose on test output
- do not run golangci-lint in system-tests
Apply retries as global, config-level option `downloadRetries` so that
it can be applied to any aptly command which downloads objects.
Unwrap `errors.Wrap` which is used in downloader.
Unwrap `*url.Error` which should be the actual error returned from the
HTTP client, catch more cases, be more specific around failures.
Christoph Fiehe
André Roth
Lorenzo Bolla
Andrey Smirnov