move ci to github actions

Author: leafo

.github/workflows/test.yml

@@ -0,0 +1,18 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+      - run: go test -v -race ./...

.gitlab-ci.yml

@@ -1,9 +1,8 @@
 # smaug
 
-[![build status](https://git.itch.ovh/itchio/smaug/badges/master/build.svg)](https://git.itch.ovh/itchio/smaug/commits/master)
-[![codecov](https://codecov.io/gh/itchio/smaug/branch/master/graph/badge.svg)](https://codecov.io/gh/itchio/smaug)
+[![CI](https://github.com/itchio/smaug/actions/workflows/test.yml/badge.svg)](https://github.com/itchio/smaug/actions/workflows/test.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/itchio/smaug)](https://goreportcard.com/report/github.com/itchio/smaug)
-[![GoDoc](https://godoc.org/github.com/itchio/smaug?status.svg)](https://godoc.org/github.com/itchio/smaug)
+[![Go Reference](https://pkg.go.dev/badge/github.com/itchio/smaug.svg)](https://pkg.go.dev/github.com/itchio/smaug)
 [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/itchio/smaug/blob/master/LICENSE)
 
 smaug contains utilities for running processes: