diff --git a/.editorconfig b/.editorconfig
index cec4693..cfbf1d1 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -13,8 +13,8 @@ trim_trailing_whitespace = true
 [*.md]
 trim_trailing_whitespace = false
 
-[*.mk]
+[{Makefile,*.mk}]
 indent_style = tab
 
-[Makefile]
-indent_style = tab
+[*.yml]
+indent_size = 2
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..cb79ab0
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,49 @@
+name: CI
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        # TODO: Generate matrix from directory?
+        # TODO: Conditionally build based on files changed?
+        include:
+          - vendor: arduino
+            board: mega2560
+          - vendor: system76
+            board: addw1
+          - vendor: system76
+            board: addw2
+          - vendor: system76
+            board: bonw14
+          - vendor: system76
+            board: darp5
+          - vendor: system76
+            board: darp7
+          - vendor: system76
+            board: galp3-c
+          - vendor: system76
+            board: galp5
+          - vendor: system76
+            board: gaze15
+          - vendor: system76
+            board: lemp9
+          - vendor: system76
+            board: lemp10
+          - vendor: system76
+            board: oryp5
+          - vendor: system76
+            board: oryp6
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: ./scripts/deps.sh
+
+      - name: Build firmware
+        run: make BOARD=${{ matrix.vendor}}/${{ matrix.board }}