Add GH action to build plugin

.github/workflows/release-plugin.yml

@@ -0,0 +1,35 @@
+name: Release Obsidian plugin
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  build-plugin:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "18.x"
+
+      - name: Build plugin
+        run: |
+          cd plugin
+          npm install
+          npm run build
+
+      - name: Create release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          tag="${GITHUB_REF#refs/tags/}"
+
+          gh release create "$tag" \
+            --title="$tag" \
+            --draft \
+            main.js manifest.json styles.css