Feature Request: Ability to download all artifacts

[andersonvom]

Use case

It would be nice to be able to just specify --download-artifacts (without any other parameters) or even a completely different --download-all-artifacts option and download all artifacts from bitrise, instead of having to list them by name or partial name. This is particularly useful for builds that generate many artifacts, when updating artifact name schema, or when new artifacts start to be collected.

Example

# say a build generates the following artifacts:
#   - example-1.2.3-4567-release-amd64.tar.gz
#   - example-1.2.3-4567-release-arm64.tar.gz
#   - example-1.2.3-4567-debug-amd64.tar.gz
#   - version-info.json
#   - build.log

# We could allow users to download all artifacts with one of these options:
$ gitrise.sh ... --download-artifacts
$ gitrise.sh ... --download-all-artifacts