Add github action for automatically building the app

.github/workflows/build.yml

@@ -0,0 +1,37 @@
+name: Build/release
+
+on: push
+
+jobs:
+  release:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v1
+
+      - name: Install Node.js, NPM and Yarn
+        uses: actions/setup-node@v1
+        with:
+          node-version: 10
+
+      - name: Build/release Electron app
+        uses: samuelmeuli/action-electron-builder@v1
+        with:
+          # Specify electron-builder config file
+          args: -c electron-builder.json5
+
+          # NPM script to execute before electron-builder
+          build_script_name: prebuild
+
+          # GitHub token, automatically provided to the action
+          # (No need to define this secret in the repo settings)
+          github_token: ${{ secrets.github_token }}
+
+          # If the commit is tagged with a version (e.g. "v1.0.0"),
+          # release the app after building
+          release: ${{ startsWith(github.ref, 'refs/tags/v') }}

package.json

@@ -21,6 +21,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc --noEmit && vite build && electron-builder -c electron-builder.json5",
+    "prebuild": "vue-tsc --noEmit && vite build",
     "preview": "vite preview",
     "build_grammar": "lezer-generator src/editor/lang-heynote/heynote.grammar -o src/editor/lang-heynote/parser.js"
   },