add size check of user-supplied challenges #11

	name: Pull Request Workflow
	on:
	pull_request:
	workflow_dispatch:
	push:
	branches:
	- master
	jobs:
	checks:
	name: Workspace Checks
	runs-on: ubuntu-latest
	steps:

	- name: Checkout
	uses: actions/checkout@v2

	- uses: actions/setup-go@v2
	with:
	go-version: '1.20'

	- name: Lint
	run: if [ "$(gofmt -s -l . \| wc -l)" -gt 0 ]; then exit 1; fi

	- name: Tidy
	run: \|
	go mod tidy
	if [[ -n $(git status -s) ]]; then exit 1; fi

	- name: Vet
	run: go vet ./...

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

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