Document use of the build plugin #186

Job	Run time
Construct Examples matrix	3s
Benchmarks / Construct Benchmarks matrix	4s
Cxx interop / Construct Cxx interop matrix	5s
Soundness / Check generated code	1m 15s
Soundness / Swift license headers check	7s
Unit tests / Construct unit test matrix	4s
Soundness / Broken symlinks check	3s
Soundness / API breakage check	1m 10s
Soundness / Documentation check	1m 19s
Soundness / Format check	31s
Soundness / License headers check	2s
Soundness / Python lint check	3s
Soundness / Shell check	31s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	3s
Examples / Linux (6.0)	2m 34s
Examples / Linux (nightly-6.1)	2m 35s
Examples / Linux (nightly-main)	2m 34s
Unit tests / Unit tests / Linux (6.0)	1m 25s
Cxx interop / Cxx interop / Linux (6.0)	1m 1s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 36s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 7s
Unit tests / Unit tests / Linux (nightly-main)	1m 38s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 1s
Benchmarks / Benchmarks / Linux (6.0)	2m 27s
Benchmarks / Benchmarks / Linux (nightly-6.1)	2m 33s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 34s
	28m 27s

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