Update GitHub actions, fix code according to golanci-lint latest version #83

	name: build

	on:
	push:
	branches:
	tags:
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-latest

	steps:
	- name: set up go 1.19
	uses: actions/setup-go@v5
	with:
	go-version: "1.19"
	id: go

	- name: checkout
	uses: actions/checkout@v4

	- name: build and test
	run: \|
	go test -timeout=60s -race
	go build -race

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v4
	with:
	version: latest
	working-directory: backend/app

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