pkg/sqlutil/pg: create package; expand env config; add example relay #401

	name: Observability Lib Checks

	on:
	push:
	paths:
	- "observability-lib/**"

	jobs:
	run-tests:
	defaults:
	run:
	working-directory: observability-lib
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4

	- name: Set up Go
	uses: actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491 # v5.0.0
	with:
	go-version-file: "go.mod"

	- name: Build
	run: make build

	- name: Unit Tests
	run: make test

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