ci: add caching to rust test

Author: azixus

.github/actions/rust-test-action/action.yml

@@ -21,6 +21,29 @@ runs:
       with:
         tool: nextest,cargo-hack
 
+    - name: Cache Cargo registry 🔧
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-registry-
+
+    - name: Cache Cargo index 🔧
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-index-
+
+    - name: Cache Cargo build 🔧
+      uses: actions/cache@v3
+      with:
+        path: ${{ inputs.target-folder }}
+        key: ${{ runner.os }}-cargo-build-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+
     - name: Check formatting
       working-directory: ${{ inputs.working-directory }}
       run: cargo fmt --check ${{ inputs.additional-flags }}