Migrating the measurement and publish workflows to GitHub Actions #18

Job	Run time
set-image	7s
clippy-examples (STD)	17m 34s
check (STD)	7m 0s
clippy-examples (WASM)	2m 54s
clippy	3m 57s
dylint	3m 58s
check (WASM)	1m 23s
check (RISCV)	1m 33s
fmt	2m 24s
spellcheck	1m 38s
examples-test	15m 46s
build (STD)	24m 35s
test	10m 54s
build (WASM)	1m 28s
codecov	20m 43s
docs	4m 6s
examples-docs	3m 55s
examples-contract-build (WASM)	23m 28s
examples-contract-build (RISCV)	3m 15s
measurements / contract-sizes	22m 56s
	2h 53m 34s

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