ci: set up GitHub Actions

.editorconfig

@@ -30,3 +30,6 @@ indent_style = tab
 
 [*.sh]
 end_of_line = lf
+
+[*.yaml]
+indent_size = 2

.github/workflows/build_firmware.yaml

@@ -0,0 +1,64 @@
+# Largely based on QMK's builtin workflow but tailored for my usage with Vial
+name: Build Vial firmware
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - keyboards/**
+      - vial-qmk/**
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: Build Userspace Firmware
+    runs-on: ubuntu-latest
+    container: qmkfm/base_container
+    steps:
+      - name: Checkout Userspace
+        uses: actions/checkout@v4
+        with:
+          token: ${{ github.token }}
+          submodules: recursive
+      - name: Install QMK CLI
+        run: |
+          python3 -m pip install --upgrade qmk
+          python3 -m pip install -r vial-qmk/requirements.txt
+      - name: Configure QMK CLI
+        run: |
+          qmk config userspace_compile.parallel=$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || getconf _NPROCESSORS_ONLN 2>/dev/null)
+          qmk config user.qmk_home=$GITHUB_WORKSPACE/vial-qmk
+          qmk config user.overlay_dir=$GITHUB_WORKSPACE
+      - name: Validate userspace
+        run: |
+          qmk userspace-doctor
+      - name: Build
+        run: |
+          qmk userspace-compile -e DUMP_CI_METADATA=yes || touch .failed
+          # Generate the step summary markdown
+          ./qmk_firmware/util/ci/generate_failure_markdown.sh > $GITHUB_STEP_SUMMARY || true
+          # Truncate to a maximum of 1MB to deal with GitHub workflow limit
+          truncate --size='<960K' $GITHUB_STEP_SUMMARY || true
+          # Exit with failure if the compilation stage failed
+          [ ! -f .failed ] || exit 1
+
+      - name: Upload binaries
+        uses: actions/upload-artifact@v4
+        if: always() && !cancelled()
+        continue-on-error: true
+        with:
+          name: Firmware
+          path: |
+            *.bin
+            *.hex
+            *.uf2
+
+  publish:
+    name: 'QMK Userspace Publish'
+    uses: qmk/.github/.github/workflows/qmk_userspace_publish.yml@main
+    if: always() && !cancelled()
+    needs: build

qmk.json

@@ -1,4 +1,6 @@
 {
     "userspace_version": "1.0",
-    "build_targets": []
-}
+    "build_targets": [
+        ["aki27/cocot46plus", "vial"]
+    ]
+}