Document use of the build plugin #191

Job	Run time
Construct Examples matrix	3s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	2s
Soundness / Check generated code	1m 16s
Soundness / Swift license headers check	9s
Unit tests / Construct unit test matrix	5s
Soundness / API breakage check	1m 9s
Soundness / Documentation check	1m 19s
Soundness / Unacceptable language check	5s
Soundness / License headers check	5s
Soundness / Broken symlinks check	4s
Soundness / Format check	34s
Soundness / Shell check	35s
Soundness / YAML lint check	4s
Soundness / Python lint check	6s
Examples / Linux (6.0)	2m 0s
Examples / Linux (nightly-6.1)	2m 0s
Examples / Linux (nightly-main)	2m 0s
Cxx interop / Cxx interop / Linux (6.0)	55s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 6s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 12s
Benchmarks / Benchmarks / Linux (6.0)	1m 58s
Benchmarks / Benchmarks / Linux (nightly-6.1)	1m 57s
Benchmarks / Benchmarks / Linux (nightly-main)	1m 58s
Unit tests / Unit tests / Linux (6.0)	1m 28s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 39s
Unit tests / Unit tests / Linux (nightly-main)	1m 34s
	25m 25s

Provide feedback