Use the protoc build plugin in examples #163

Job	Run time
Soundness / Check generated code	1m 7s
Benchmarks / Construct Benchmarks matrix	2s
Cxx interop / Construct Cxx interop matrix	3s
Soundness / Swift license headers check	5s
Unit tests / Construct unit test matrix	4s
Examples / Windows (6.0)	3s
Examples / Linux (5.9)	22s
Examples / Windows (nightly-6.0)	1s
Examples / Linux (5.10)	25s
Examples / Windows (nightly-main)	1s
Examples / Linux (6.0)	3m 50s
Examples / Linux (nightly-6.0)	3m 45s
Examples / Linux (nightly-main)	3m 30s
Soundness / API breakage check	1m 12s
Soundness / Broken symlinks check	5s
Soundness / Documentation check	1m 22s
Soundness / Format check	32s
Soundness / License headers check	3s
Soundness / Python lint check	6s
Soundness / Shell check	35s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	3s
Benchmarks / Benchmarks / Linux (6.0)	2m 38s
Benchmarks / Benchmarks / Linux (nightly-6.1)	2m 53s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 42s
Cxx interop / Cxx interop / Linux (6.0)	54s
Cxx interop / Cxx interop / Linux (nightly-6.1)	1m 3s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 5s
Unit tests / Unit tests / Linux (6.0)	1m 30s
Unit tests / Unit tests / Linux (nightly-6.1)	1m 36s
Unit tests / Unit tests / Linux (nightly-main)	1m 36s
	33m 17s

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