chore: add GPL 3.0 headers on all source files #44

Job	Run time
Quality assessment via scripts (pnpm depcheck)	1s
Quality assessment via scripts (pnpm depcheck)	1m 32s
Quality assessment via scripts (pnpm depcheck)	1m 32s
Quality assessment via scripts (pnpm unimported)	1s
Quality assessment via scripts (pnpm unimported)	2m 27s
Quality assessment via scripts (pnpm unimported)	2m 27s
Quality assessment via scripts (pnpm lint:ci)	1s
Quality assessment via scripts (pnpm lint:ci)	2m 36s
Quality assessment via scripts (pnpm lint:ci)	2m 36s
Test build	1s
Test build	5m 31s
Test build	14m 28s
	33m 13s

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