Fix artifact download url construction

[sikmir]

Resolves #660

[codecov[bot]]

Codecov Report

Base: 37.98% // Head: 37.98% // No change to project coverage :thumbsup:

Coverage data is based on head (cb4c34c) compared to base (c604484). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #750 +/- ## ======================================= Coverage 37.98% 37.98% ======================================= Files 13 13 Lines 416 416 ======================================= Hits 158 158 Misses 246 246 Partials 12 12 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `37.98% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jenkins-zh#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jenkins-zh). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jenkins-zh)

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[LinuxSuRen]

hi @sikmir , thanks for the fixing. I'll test this PR as soon as possible. Those e2e tests might be outdated. Please ignore them.