ci: fix checksum (#75)

.github/workflows/checks.yml

@@ -0,0 +1,26 @@
+name: checks
+
+on:
+  push:
+  pull_request:
+    paths:
+      - ".github/workflows/checks.yml"
+      - "dist/index.js"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node.js 12.x
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12.x
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Checksum
+        run: npm run checksum

.github/workflows/ci.yml

@@ -31,9 +31,6 @@ jobs:
       - name: Build
         run: npm run build
 
-      - name: Checksum
-        run: npm run checksum
-
       - name: Set up Deno ${{ matrix.deno }}
         uses: ./
         with: