9658d0dc17 ci: Run "macOS native x86_64" job on GitHub Actions (Hennadii Stepanov)
Pull request description:
From https://github.com/bitcoin/bitcoin/issues/28098:
> Thus, someone would have to sponsor an amount of roughly 5kUSD/mo for those two tasks.
> If the goal is to stay on a free plan, I think the only option is GitHub Actions CI.
---
**IMPORTANT NOTE**. We currently ship macOS release binaries for both architectures: `x86_64` and `arm64`. If this PR gets merged, only `x86_64` architecture will be tested on CI, which implies some [drawbacks](https://github.com/bitcoin/bitcoin/pull/28187#issuecomment-1658077549).
However, it has never been the case that our CI tested both architectures simultaneously. And we hope that GitHub Actions will soon host macOS `arm64` runners.
Historically, we moved from `x86_64` to `arm64` in https://github.com/bitcoin/bitcoin/pull/26388 less than a year ago.
---
Security concerns:
- https://github.com/bitcoin/bitcoin/issues/28098#issuecomment-1651432106
- https://github.com/bitcoin/bitcoin/issues/28098#issuecomment-1651688197
`GITHUB_TOKEN` permissions (from the build log in my personal repo):
```
2023-07-27T07:30:17.8313534Z ##[group]GITHUB_TOKEN Permissions
2023-07-27T07:30:17.8314113Z Contents: read
2023-07-27T07:30:17.8314608Z Metadata: read
2023-07-27T07:30:17.8314957Z Packages: read
2023-07-27T07:30:17.8315233Z ##[endgroup]
```
Comparison of resources:
| Resource | Current, Cirrus CI | Suggested, GitHub Actions |
|---|:-:|:-:|
| CPU | 4 | 4 \*\* |
| RAM, GB | 8 | 14 |
**\*\* NOTE**: However, [docs](https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources) are mentioning:
> 3-core CPU (x86_64)
ACKs for top commit:
MarcoFalke:
re-ACK 9658d0dc17🏂
achow101:
ACK 9658d0dc17
jarolrod:
ACK 9658d0dc17
Tree-SHA512: 6123e68e6784cdf4e53c3e77b435709261db21f09091af2c22e667d3816a305fffb9d617297a5bc1bda18aaba84a6e210cec6a75c52afa7746a3780a67b69865
b97b05048d