Use the codecov GH Action

[brettcannon]

BPO	39777
Nosy	@brettcannon, @zooba, @ammaraskar

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-02-27.21:09:04.987>
labels = []
title = 'Use the codecov GH Action'
updated_at = <Date 2020-02-27.21:26:43.895>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2020-02-27.21:26:43.895>
actor = 'ammar2'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-02-27.21:09:04.987>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 39777
keywords = []
message_count = 3.0
messages = ['362839', '362843', '362845']
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nosy_names = ['brett.cannon', 'steve.dower', 'ammar2']
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status = 'open'
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url = 'https://bugs.python.org/issue39777'
versions = []

[brettcannon]

Codecov provides a GH Action for uploading coverage reports which we might as well use instead of their bash uploader: https://github.com/marketplace/actions/codecov.

[ammaraskar]

This has the disadvantage that it won't work for PRs because Github doesn't make secrets like ${{ secrets.CODECOV_TOKEN }} available in PRs.

See: codecov/codecov-action#29

[ammaraskar]

On a second look, we currently do this anyway:

cpython/.github/workflows/coverage.yml

Lines 66 to 70 in 374d998

	run: |
	source ./.venv/bin/activate
	bash <(curl -s https://codecov.io/bash)
	env:
	CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

and don't run coverage for PRs so it shouldn't matter.

[hugovk]

No longer relevant, we removed coverage from the CI in #25679.