add workflow

.github/workflows/blah.yml

@@ -0,0 +1,33 @@
+name: Build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+
+    env:
+      RUNNER_TOOL_CACHE: /toolcache  # https://about.gitea.com/resources/tutorials/enable-gitea-actions-cache-to-accelerate-cicd
+      AGENT_TOOLSDIRECTORY: /toolcache  # https://github.com/actions/setup-python/issues/824
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Zephyr project
+        uses: zephyrproject-rtos/action-zephyr-setup@v1
+        with:
+          app-path: mellifera
+          toolchains: arm-zephyr-eabi
+
+      - name: Build
+        run: |
+          west build -b nrf52dk/nrf52832 mellifera/app
+
+      - name: upload
+        uses: actions/upload-artifact@v3
+        with:
+          path: build/