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add .metals to .gitignore; fix wrong go.mod header #347

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Run time

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Job	Run time
build (11, 1.18)	4m 50s
build (11, 1.20)	4m 53s
build (16, 1.18)	4m 49s
build (16, 1.20)	4m 50s
	19m 22s