basic linux workflow

.github/workflows/linux.yml

@@ -0,0 +1,61 @@
+on:
+  push
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout repo (with submodules)
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Update apt repos & install build deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential libfuse2 fonts-noto-color-emoji libdbus-1-dev
+
+      - name: Build webbluetooth dependency
+        run: |
+          cd api/webbluetooth
+          npm i
+          npm run build:all
+
+      - name: Run update script
+        run: ./update.mjs
+
+      - name: Install electron dependencies
+        run: |
+          cd electron
+          npm install
+
+      - name: Ensure Electron build output exists
+        run: |
+          cd electron
+          # Check if entry file exists
+          if [ ! -f "out/main/index.js" ]; then
+            echo "⚠️ Entry file missing. Running build..."
+            npm run build || npm run build:all || echo "No build script available, skipping..."
+          else
+            echo "✅ Build output detected. Skipping rebuild."
+          fi
+
+      - name: Build Electron AppImage
+        run: |
+          cd electron
+          npx electron-builder --linux AppImage
+
+      - name: Generate SHA‑256 checksum
+        run: |
+          cd electron/dist
+          sha256sum *.AppImage > sha256sum.txt
+          cat sha256sum.txt
+
+      - name: Upload AppImage & checksum artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: meshsense-linux
+          path: |
+            electron/dist/*.AppImage
+            electron/dist/sha256sum.txt