{eth,jrpc2}: new packages. support indexing from standard json rpc #296

	name: go

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]
	jobs:
	build:
	name: "go mod tidy"
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: "1.21"
	# Cache Go modules if go.sum is unchanged.
	# Docs here: https://github.com/actions/cache/blob/9c7b3e90bdf39569c497c98e469f8a00e061c43f/examples.md#linux-1
	- uses: actions/cache@v3
	with:
	path: \|
	~/.cache/go-build
	~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-go-
	- name: check 'go mod tidy'
	run: \|
	go mod tidy
	echo
	echo
	git diff --name-only --exit-code \|\| (echo "Please run 'go mod tidy'."; exit 1)

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