Migrating the measurement and publish workflows to GitHub Actions #26

Job	Run time
set-image	1s
clippy	2m 33s
clippy-examples (STD)	11m 58s
dylint	2m 23s
check (STD)	12m 31s
clippy-examples (WASM)	2m 26s
fmt	1m 52s
check (WASM)	1m 7s
check (RISCV)	1m 36s
spellcheck	1m 43s
examples-test	15m 33s
test	15m 0s
codecov	41m 21s
build (STD)	11m 44s
docs	2m 16s
build (WASM)	1m 26s
examples-contract-build (WASM)	15m 0s
examples-contract-build (RISCV)	4m 20s
examples-docs	3m 42s
measurements / contract-sizes	34m 16s
	3h 2m 48s

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