Add caching

Author: XAMPPRocky

.github/workflows/main.yml

@@ -10,9 +10,13 @@ jobs:
     name: CI
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v2
+      - name: Cache cargo
+        uses: actions/cache@v1
         with:
-          fetch-depth: 50
+          path: target
+          key: cargo-build-${{ hashFiles('**/Cargo.lock') }}
+          restore-key: cargo-build-
       - name: Build Blog
         run: cargo run
       - name: Deploy to GitHub Pages