Migration of Gitlab lint, check, workspace, examples stages to GitHub Actions #11

Job	Run time
set-image	1s
dylint	5m 37s
clippy-examples (STD)	14m 38s
check (STD)	10m 31s
clippy-examples (WASM)	3m 34s
clippy	10m 41s
check (WASM)	1m 47s
fmt	2m 18s
check (RISCV)	1m 59s
spellcheck	1m 55s
test	12m 28s
build (STD)	13m 51s
build (WASM)	2m 35s
examples-test	17m 40s
codecov	38m 12s
docs	10m 2s
examples-docs	4m 17s
examples-contract-build (WASM)	24m 28s
examples-contract-build (RISCV)	3m 50s
	3h 0m 24s

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