Update codecov to grcov from Tarpauline

[rajarshimaitra]

Description

To match with existing codecov of BDK, Tarpaulin based codecov in bdk-cli is changed to grcov.

Notes to the reviewers

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

[rajarshimaitra]

Although it seems we haven't been using the codecov reporting lately. There were no codecov reports for previous PRs.

@notmandatory is this intentional or something was off with Tarpaulin?

[notmandatory]

Looks like a something needs to be done to fix the failure seen here: https://github.com/rajarshimaitra/bdk-cli/runs/4340753274?check_suite_focus=true

This project has a rust-toolchain file that's overriding the nightly toolchain, we either need to remove this file, or add to the codecov job:

rustup override set nightly

[notmandatory]

Although it seems we haven't been using the codecov reporting lately. There were no codecov reports for previous PRs.

@notmandatory is this intentional or something was off with Tarpaulin?

You mean no codecov reports for bdk-cli lately? I think they're being generated but not displayed inline, here's the latest one that was generated: https://app.codecov.io/gh/bitcoindevkit/bdk-cli/commit/b0c78e0aef181b2156c29549c3e27712166a4e49

[rajarshimaitra]

Looks like a something needs to be done to fix the failure seen here:

I am not sure if we need the file. But for now I have set the override in CI.

I think they're being generated but not displayed inline,

Yes the coverage reports are generating fine, but they are not being displayed in PR page here. Also the same for bdk project. Maybe we need to add CodeCov App to github like this? https://docs.codecov.com/docs/how-to-create-a-github-app-for-codecov-enterprise

[notmandatory]

ACK 17c9329

Also I think I've enabled the Codecov app for the bitcoindevkit org.. it should activate next time code is pushed to this repo.

[notmandatory]

This one looks like it needs a rebase to get it to rerun the tests for rust 1.56.1 and then we can merge it.

[rajarshimaitra]

Rebased.