use cover.png instead of cover.jpg for cover image #697

	name: Go

	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@v4
	with:
	go-version: '1.22'

	- name: Set up Core
	run: go install cogentcore.org/core/cmd/core@main && core setup

	- name: Build
	run: go build -v ./...

	- name: Test
	run: go test -v ./... -coverprofile cover.out

	- name: Update coverage report
	uses: ncruces/go-coverage-report@v0
	with:
	coverage-file: cover.out
	if: github.event_name == 'push'

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