Move publish-docs job to GHA (#1993) #90

Job	Run time
set-image	1s
check (STD)	7m 23s
clippy-examples (STD)	9m 0s
clippy	8m 52s
clippy-examples (WASM)	3m 16s
check (WASM)	1m 37s
check (RISCV)	1m 36s
dylint	4m 2s
fmt	1m 55s
spellcheck	1m 11s
build (STD)	12m 0s
test	14m 6s
build (WASM)	1m 43s
examples-test	18m 51s
docs	7m 14s
codecov	21m 3s
examples-contract-build (WASM)	15m 28s
examples-docs	3m 44s
examples-contract-build (RISCV)	2m 55s
measurements / contract-sizes	0s
	2h 15m 57s

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