new(pkg,docker): added an amazonlinux2 gcc10 builder. #76

Job	Run time
Enforce go.mod tidiness	28s
paths-filter	3s
build-test-dev (amd64) / build-test	12m 26s
build-test-dev (arm64) / build-test	14m 44s
build-images-dev (amd64) / build-images	8m 38s
build-images-dev (arm64) / build-images	10m 25s
	46m 44s

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