ci: build and test using GitHub Actions

.github/FUNDING.yml

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+github: Bogdanp
+patreon: popabogdanp

.github/workflows/push.yml

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+on: push
+name: main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Build and Test
+      uses: docker://jackfirth/racket:7.3-full
+      with:
+        entrypoint: /github/workspace/ci/build.sh

README.md

@@ -1,5 +1,7 @@
 # racket-sass
 
+[![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2FBogdanp%2Fracket-sass%2Fbadge&style=flat)](https://actions-badge.atrox.dev/Bogdanp/racket-sass/goto)
+
 Racket bindings for [libsass].
 
 ## TODOs

ci/build.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+pushd /github/workspace
+raco pkg install --auto --batch sass/
+raco test -j 4 sass/
+popd