ci: cache

resolves #6

Author: Nugine

.github/workflows/ci.yml

@@ -12,10 +12,17 @@ on:
 jobs:
   deno:
     runs-on: ubuntu-latest
+    env:
+      DENO_DIR: ""
     steps:
       - uses: actions/checkout@v4
       - uses: taiki-e/install-action@just
       - uses: denoland/setup-deno@v2
+      - run: echo "DENO_DIR=$HOME/.cache/deno" >> $GITHUB_ENV
+      - uses: actions/cache@v4
+        with:
+          path: ${{ env.DENO_DIR }}
+          key: deno-${{ hashFiles('deno.lock') }}
       - run: just ci
 
   test: