nix: Simplify flake #232

	name: Build and test
	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: '1.20'
	- name: Build
	run: go build -o pushup -ldflags "-s -w -extldflags '-static'" -v
	env:
	CGO_ENABLED: 0
	- name: Test
	run: go test -v . ./_runtime
	- name: Upload Pushup executable
	uses: actions/upload-artifact@v3
	with:
	name: pushup-exe
	path: pushup
	retention-days: 3

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