add tool for config file validation and envvar replacement #1

	name: Validator Tests

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

	jobs:
	check-schema:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: '~1.22'

	- name: Build
	run: make validator

	- name: Test
	run: \|
	cd validator
	go test .

	- name: Run ShellTests
	run: \|
	cd validator

	apt update
	apt install shelltestrunner

	shelltest -c --diff --all shelltests/*.test

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