feat: count unread message in mailbox #1

# to view logs

	name: "CI"

	on:
	push:
	branches:
	- "main"
	pull_request:
	branches:
	- "main"
	workflow_call:

	jobs:
	ci:
	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v3
	with:
	go-version: '>=1.18.0'

	- name: Install dependencies
	run: \|
	go version
	go install golang.org/x/lint/golint@latest
	- name: Build
	run: go build .

	- name: Run Vet & Lint
	run: \|
	go vet .
	golint -set_exit_status=1 .

	test:
	runs-on: ubuntu-22.04

	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v3
	with:
	go-version: '>=1.18.0'

	- name: Install dependencies
	run: \|
	go version

	- name: Test
	run: go test ./...

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