golang: add test coverage, and fix handling of files with multiple build-tags #34

	name: Go
	on: [push, pull_request]
	jobs:

	build:
	name: Build
	runs-on: ubuntu-latest
	steps:

	- name: Set up Go 1.18
	uses: actions/setup-go@v2
	with:
	go-version: 1.18
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v2

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

	- name: Build
	run: go build -v .

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