remove docker caching step

.github/workflows/prerelease.yml

@@ -1,35 +0,0 @@
-name: Pre Release
-
-on:
-  push:
-    branches:
-      - master
-
-jobs:
-  build-image-for-cache:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Set up Docker Buildx
-      uses: crazy-max/ghaction-docker-buildx@v3
-
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.OS }}-buildx-${{ hashFiles('**/yarn.lock') }}-default
-        restore-keys: |
-          ${{ runner.os }}-buildx-
-
-    - name: Build Docker Image
-      run: |
-        docker buildx build \
-          --cache-from "type=local,src=/tmp/.buildx-cache" \
-          --cache-to "type=local,dest=/tmp/.buildx-cache" \
-          --platform linux/amd64 \
-          --load \
-          --file ./docker/Dockerfile .

.github/workflows/release.yml

@@ -78,21 +78,9 @@ jobs:
       run: |
         echo ${{ secrets. DOCKER_REGISTRY_PASSWORD }} | docker login --username wsmoogle --password-stdin
 
-    - name: Cache Docker layers
-      uses: actions/cache@v2
-      id: cache
-      with:
-        path: /tmp/.buildx-cache
-        key: ${{ runner.OS }}-buildx-${{ hashFiles('**/yarn.lock') }}-${{ matrix.flavor }}
-        restore-keys: |
-          ${{ runner.OS }}-buildx-${{ hashFiles('**/yarn.lock') }}-
-          ${{ runner.OS }}-buildx-
-
     - name: Build Docker Image
       run: |
         docker buildx build \
-          --cache-from "type=local,src=/tmp/.buildx-cache" \
-          --cache-to "type=local,dest=/tmp/.buildx-cache" \
           --tag growi${{ env.SUFFIX }} \
           --build-arg flavor=${{ matrix.flavor }} \
           --platform linux/amd64 \