feat(ci-cd): use caching to speed up build

.github/workflows/ci.yml

@@ -22,6 +22,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
       - name: Migrate database
         run: |
           sudo apt-get install libpq-dev -y