reenable caching of sd model

.github/workflows/test-invoke-conda.yml

@@ -55,6 +55,16 @@ jobs:
       - name: set conda environment name
         run: echo "CONDA_ENV_NAME=invokeai" >> $GITHUB_ENV
 
+      - name: Use Cached Stable Diffusion Model
+        id: cache-stable-diffusion-model
+        uses: actions/cache@v3
+        env:
+          cache-name: cache-sd-${{ matrix.stable-diffusion-model }}
+        with:
+          path: models/ldm/stable-diffusion-v1/model.ckpt
+          key: ${{ env.cache-name }}
+          restore-keys: ${{ env.cache-name }}
+
       - name: Download Stable Diffusion v1.4 Model
         if: ${{ steps.cache-sd-v1-4.outputs.cache-hit != 'true' }}
         run: |