Merge pull request #6 from woodruffw/ci

ci: Add GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+  schedule:
+    - cron: '0 12 * * *'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: deps
+        run: |
+          curl -sL "https://keybase.io/crystal/pgp_keys.asc" | sudo apt-key add -
+          echo "deb https://dist.crystal-lang.org/apt crystal main" | sudo tee /etc/apt/sources.list.d/crystal.list
+          sudo apt-get update
+          sudo apt install -y crystal
+      - name: lint
+        run: crystal tool format --check src/
+      - name: build
+        run: shards build --production

README.md

@@ -1,5 +1,7 @@
 # notify
 
+[![Build Status](https://img.shields.io/github/workflow/status/woodruffw/notify.cr/CI/master)](https://github.com/woodruffw/notify.cr/actions?query=workflow%3ACI)
+
 A Crystal library for
 [Desktop Notifications](http://www.galago-project.org/specs/notification/0.9/index.html) compatible
 notification daemons. Uses DBus internally.