Enable MemberImportVisibility check on all targets. Use a standard
string header and footer to bracket the new block for ease of updating
in the future with scripts.
Migrate CI to use GitHub Actions.
### Motivation:
To migrate to GitHub actions and centralised infrastructure.
### Modifications:
Changes of note:
* Adopt swift-format using rules from SwiftNIO.
* Remove scripts and docker files which are no longer needed.
* Disabled warnings-as-errors on Swift 6.0 CI pipelines for now.
### Result:
Feature parity with old CI.
## Motivation
Some of the test code was missing availability guards for Apple platforms, resulting in build failures for these platforms, e.g.
```
error: 'AsyncSequence' is only available in iOS 13.0 or newer
```
## Modifications
Add missing availability guards. I've tried to keep them as scoped as possible.
## Result
Tests can now build for run on iOS and other Apple platforms.
Motivation:
not accumulate too many bytes
Modifications:
Implementing collect function to use NIOCore version to prevent overflowing
Co-authored-by: Cory Benfield <lukasa@apple.com>
Rick Newton-Rogers
Si Beaumont
carolinacass