Switch from Travis CI to GitHub Actions

.github/webhook.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+set -e
+
+# Report unnamed symbols
+content="$(tools/unnamed.py -r . pokeyellow.sym | head)"
+
+curl -H 'Content-Type: application/json' -X POST "$DISCORD_WEBHOOK_URL" -d@- << EOF
+{
+    "username": "OK",
+    "avatar_url": "https://i.imgur.com/38BQHdd.png",
+    "content": "\`\`\`$(echo "$content" | sed -E ':a;N;$!ba;s/\r{0,1}\n/\\n/g')\`\`\`"
+}
+EOF

.github/workflows/main.yml

@@ -0,0 +1,45 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Checkout rgbds
+        uses: actions/checkout@master
+        with:
+          path: rgbds
+          ref: v0.5.1
+          repository: gbdev/rgbds
+
+      - name: Install rgbds
+        working-directory: rgbds
+        run: |
+          sudo make install
+
+      - name: Remove rgbds
+        run: |
+          rm -rf rgbds
+
+      - name: Compare
+        run: |
+          make DEBUG=1 -j$(nproc) compare
+          if ! git diff-index --quiet HEAD --; then
+            echo 'Uncommitted changes detected:'
+            git diff-index HEAD --
+            return 1
+          fi
+
+      - name: Discord webhook
+        if: ${{ github.event_name == 'push' && github.repository_owner == 'pret' }}
+        env:
+          DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
+        run: |
+          .github/webhook.sh

README.md

@@ -1,4 +1,4 @@
-# Pokémon Yellow [![Build Status][travis-badge]][travis]
+# Pokémon Yellow [![Build Status][ci-badge]][ci]
 
 This is a disassembly of Pokémon Yellow.
 
@@ -36,5 +36,5 @@ Other disassembly projects:
 [pokeemerald]: https://github.com/pret/pokeemerald
 [discord]: https://discord.gg/d5dubZ3
 [irc]: https://kiwiirc.com/client/irc.freenode.net/?#pret
-[travis]: https://travis-ci.org/pret/pokeyellow
-[travis-badge]: https://travis-ci.org/pret/pokeyellow.svg?branch=master
+[ci]: https://github.com/pret/pokeyellow/actions
+[ci-badge]: https://github.com/pret/pokeyellow/actions/workflows/main.yml/badge.svg