Threading-related fixes from upstream romanz/electrs #35

	name: CI

	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-20.04
	env:
	CARGO_TERM_COLOR: always

	steps:
	- uses: actions/checkout@v2

	- name: Cache cargo registry
	uses: actions/cache@v1
	with:
	path: ~/.cargo/registry
	key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}

	- name: Cache cargo index
	uses: actions/cache@v1
	with:
	path: ~/.cargo/git
	key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}

	- name: Cache cargo build
	uses: actions/cache@v1
	with:
	path: target
	key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}

	#- name: Check formatting
	# run: cargo fmt -- --check

	- name: Setup Rust toolchain
	run: rustup default 1.75.0

	- name: Check for errors
	run: cargo check

	- name: Tests (Bitcoin mode, REST+Electrum)
	run: cargo test

	- name: Tests (Liquid mode, REST)
	run: cargo test --features liquid

Provide feedback