Update to github actions

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: Build CI
+
+on:
+  push:
+  pull_request:
+  release:
+    types: [published]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Set up repository
+      uses: actions/checkout@v4
+      with:
+        submodules: false
+        show-progress: false
+    - name: Set up compiler
+      uses: carlosperate/arm-none-eabi-gcc-action@v1
+      with:
+        # When changing this update what Windows grabs too!
+        release: '13.2.Rel1'    
+    - name: Build
+      run: make -j$(nproc) all-boards && make drop-pkg
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with: 
+        path: build/uf2-samd1x-*.zip
+

.gitignore

@@ -8,3 +8,4 @@ node_modules
 scripts/clean-ifaces/*.plist
 .vscode/c_cpp_properties.json
 TAGS
+dist