Add cached install with test,

.github/workflows/ci.yml

@@ -33,6 +33,26 @@ jobs:
       with:
         submodules: recursive
 
+    - name: Cache toolchain
+      id: cache-toolchain
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-toolchain
+      with:
+        path: vendor/install/riscv/bin
+      run: |
+        make riscv32-gcc
+
+    - name: Cache golden
+      id: cache-golden
+      uses: actions/cache@v3
+      env:
+        cache-name: cache-golden
+      with:
+        path: golden-model
+      run: |
+        cd golden-model && source setup-py.sh
+
     - name: Run Tests
       run: |
         make golden M=12 N=16 K=16