Document use of the build plugin #194

Job	Run time
Construct Examples matrix	3s
Soundness / Check generated code	1m 16s
Soundness / Swift license headers check	7s
Benchmarks / Construct Benchmarks matrix	3s
Cxx interop / Construct Cxx interop matrix	4s
Unit tests / Construct unit test matrix	2s
Soundness / API breakage check	1m 7s
Soundness / Documentation check	1m 20s
Soundness / Unacceptable language check	5s
Soundness / License headers check	5s
Soundness / Broken symlinks check	5s
Soundness / Format check	38s
Soundness / Shell check	32s
Soundness / YAML lint check	3s
Soundness / Python lint check	5s
Examples / Linux (6.0)	9m 41s
Examples / Linux (nightly-6.1)	3m 46s
Examples / Linux (nightly-main)	3m 24s
Unit tests / Unit tests / Linux (6.0)	1m 30s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 44s
Unit tests / Unit tests / Linux (nightly-main)	1m 49s
Benchmarks / Benchmarks / Linux (6.0)	2m 39s
Benchmarks / Benchmarks / Linux (nightly-6.1)	2m 53s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 51s
Cxx interop / Cxx interop / Linux (6.0)	58s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 10s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 5s
	39m 5s

Provide feedback