plumbing for publication of synapse 3.0.0 alpha wheels to vtx pypi services.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.22%. Comparing base (101a9fc) to head (491691b). Report is 1 commits behind head on synapse-3xx.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## synapse-3xx #3852 +/- ## ============================================ Coverage 96.22% 96.22% ============================================ Files 232 232 Lines 51829 51829 ============================================ + Hits 49874 49875 +1 + Misses 1955 1954 -1 ``` | [Flag](https://app.codecov.io/gh/vertexproject/synapse/pull/3852/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | Coverage Δ | | |---|---|---| | [linux](https://app.codecov.io/gh/vertexproject/synapse/pull/3852/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `96.22% <ø> (+<0.01%)` | :arrow_up: | 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=vertexproject#carryforward-flags-in-the-pull-request-comment) to find out more.

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