ci: add compilation workflow

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Compile for Linux
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install dependencies
+      run: |
+        sudo apt update
+        sudo apt install build-essential libgtk-3-dev libjansson-dev imagemagick xxd fonts-dejavu
+    - name: Compile
+      run: |
+        make
+    # We don't upload the artifact since it wouldn't work without appropriate
+    # libraries and installation.