ci: make github actions happy

.github/workflows/main.yml

@@ -1,7 +1,7 @@
 name: CI
 on:
-  push:
-    branches: [main]
+  - push
+  - pull_request
 
 jobs:
   build:
@@ -10,9 +10,28 @@ jobs:
       - uses: nschloe/action-cached-lfs-checkout@v1
 
       - uses: actions/setup-node@v3.1.1
+        with:
+          node-version: 16
 
-      - name: Init deps
-        run: pnpm --frozen-lockfile
+      - uses: pnpm/action-setup@v2.1.0
+        with:
+          run_install: false
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        run: |
+          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
 
       - name: Build
         run: pnpm build

.node-version

@@ -0,0 +1 @@
+16

package.json

@@ -10,6 +10,10 @@
     "build": "webpack build --config webpack.config.prod.js",
     "dev": "webpack serve --open --config webpack.config.dev.js"
   },
+  "packageManager": "pnpm@7.0.0",
+  "engines": {
+    "node": ">=16"
+  },
   "dependencies": {
     "csx": "10.0.2",
     "cytoscape": "3.21.1",