Add errcheck linter, fix issues #185

	# This workflow will build a golang project
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

	name: Go

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: '=1.21'

	- name: Format
	run: test -z $(gofmt -l .)

	- name: Vet
	run: go vet -v ./...

	- name: Staticcheck
	run: go run honnef.co/go/tools/cmd/staticcheck@2023.1.7 ./...

	- name: Errcheck
	run: go run github.com/kisielk/errcheck@v1.7.0 -ignoretests ./ ./event

	- name: Build
	run: go build -v ./...

	- name: Test
	run: go test -bench=. -short -v ./...

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