* Adopt github actions

* remove linux main

* remove old scripts

* fix check-unacceptable-language

* remove integration test target

* remove docc

* formatting adjustments to land the change for now

* fix docc

* docs fixes

* Follow-up cleanup of GitHub Actions migration

**Motivation:**

Make use of more common GitHub Actions migration workflows and
repository style changes.

**Modifications:**

* Unit tests workflows make use of the NIO `unit-tests` workflow with
  additional checks enabled
* Introduce `main.yml` which runs workflows on each commit to `main` and
  periodically to catch any regressions in merges or from upstream.
* Enable nightly CI runs as a signal for upcoming failures as is done in
  other Swift on Server ecosystem repositories.
* Remove the docker files which are no longer used and contained
  outdated pipelines.
* Bring the Samples up to Swift 5.9 and add a CI pipeline to ensure
  their continued ability to compile.

**Result:**

More in common with other GitHub Actions adoptions, compiling Samples.

* add cxx interop workflows

* enable API breakage checks

### Motivation:

Fix some typo issues at README.md

### Modifications:

+ apropriate => appropriate
+ thasks => tasks
+ heve => here

### Result:

Correct the some words at README.md

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.

Update the release.yml file with the latest label changes

CI use 6.1 nightlies now that Swift development is happening in the 6.1
branch

Rename nightly_6_1 params to nightly_next; see
apple/swift-nio#3122

Only apply standard swift settings on valid targets. The current check
ignores plugins but that is not comprehensive enough.

Motivation:

* Improve test coverage
* Check test pass/fail status
* Monitor CI throughput

Modifications:

Enable macOS CI to be run on all merges to main and on a daily timer.

Result:

Improved test coverage run out-of-band at the moment so we can get a
feeling for if any changes need to be made in the repo or in the CI
pipelines to ensure timely and stable checks.

Motivation:

Swift 6.1 has been released, we should add it to our CI coverage.

Modifications:

Add additional Swift 6.1 jobs where appropriate in main.yml,
pull_request.yml

Result:

Improved test coverage.

Samples workflow in main.yml uses new matrix

### Motivation:

The samples workflow has been failing in the main.yml version because
the adoption of the new test matrix was missed meaning it referred to
Swift 6.1 but the old workflow doesn't know how to handle that.

### Modifications:

Migrate the samples job to the new matrix workflow

### Result:

Samples workflows will pass on main and timer jobs

Motivation:

Swift 5.9 is no longer supported, we should bump the tools version and
remove it from our CI.

Modifications:

* Bump the Swift tools version to Swift 5.10
* Remove Swift 5.9 jobs where appropriate in main.yml, pull_request.yml

Result:

Code reflects our support window.

### Motivation:

We'd like to get this package building with the static Linux SDK, which
will also unblock apple#112.

### Modifications:

Update the imports to support Musl.

### Result:

Builds with `swift build --swift-sdk
swift-6.1-RELEASE_static-linux-0.0.1`.

Add static SDK CI workflow which runs on commits to PRs, merges to main
and daily on main.

---------

Co-authored-by: Si Beaumont <[email protected]>
Co-authored-by: Si Beaumont <[email protected]>

### Motivation:

Some errors do not show up in debug builds. Enabling release mode builds
improves the CI coverage.

### Modifications:

Enable release mode builds for pull requests and scheduled builds on
main.

### Result:

Improved CI coverage.