Replace current caching solution with Rust Cache

.github/workflows/cont_integration.yml

@@ -22,14 +22,6 @@ jobs:
         uses: actions/checkout@v2
       - name: Generate cache key
         run: echo "${{ matrix.rust.version }} ${{ matrix.features }}" | tee .cache_key
-      - name: cache
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('.cache_key') }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
       - name: Install Rust toolchain
         uses: actions-rs/toolchain@v1
         with:
@@ -37,6 +29,8 @@ jobs:
             override: true
             components: clippy
             profile: minimal
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@v2.2.1
       - name: Build
         run: cargo build ${{ matrix.features }}
       - name: Clippy
@@ -54,14 +48,6 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      - name: Cache
-        uses: actions/cache@v2
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            target
-          key: ${{ runner.os }}-cargo-${{ github.job }}-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
         # Install a recent version of clang that supports wasm32
       - run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - || exit 1
       - run: sudo apt-add-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-10 main" || exit 1
@@ -74,6 +60,8 @@ jobs:
             override: true
             profile: minimal
             target: "wasm32-unknown-unknown"
+      - name: Rust Cache
+        uses: Swatinem/rust-cache@v2.2.1
       - name: Check bdk
         working-directory: ./crates/bdk
         run: cargo check --target wasm32-unknown-unknown --features dev-getrandom-wasm