Document use of the build plugin #187

Job	Run time
Construct Examples matrix	2s
Benchmarks / Construct Benchmarks matrix	5s
Cxx interop / Construct Cxx interop matrix	2s
Soundness / Check generated code	1m 15s
Soundness / Swift license headers check	5s
Unit tests / Construct unit test matrix	3s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	8s
Soundness / API breakage check	10s
Soundness / Format check	9s
Soundness / License headers check	5s
Soundness / Python lint check	6s
Soundness / Shell check	10s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	5s
Examples / Linux (6.0)	0s
Examples / Linux (nightly-6.1)	0s
Examples / Linux (nightly-main)	0s
Cxx interop / Cxx interop / Linux (6.0)	27s
Cxx interop / Cxx interop / Linux (nightly-6.1)	27s
Cxx interop / Cxx interop / Linux (nightly-main)	28s
Unit tests / Unit tests / Linux (6.0)	21s
Unit tests / Unit tests / Linux (nightly-6.1)	22s
Unit tests / Unit tests / Linux (nightly-main)	21s
Benchmarks / Benchmarks / Linux (6.0)	0s
Benchmarks / Benchmarks / Linux (nightly-6.1)	0s
Benchmarks / Benchmarks / Linux (nightly-main)	0s
Examples / ${{ matrix.config.platform }} (${{ matrix.config.name }})	1s
Benchmarks / Benchmarks / ${{ matrix.config.platform }} (${{ matrix.config.name }})	1s
	4m 58s

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