add mailer struct, fix download endpoint and make logo path generic #724

	name: Go testing

	on:
	push:
	paths:
	- server/**
	workflow_dispatch:

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4
	with:
	submodules: "true"

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: "1.21"
	id: go

	- name: Get dependencies
	run: \|
	cd server && go mod download

	- name: Test
	run: cd server && go test -v ./...

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