remove unnecessary caching of docker image

.github/workflows/main.yml

@@ -29,33 +29,15 @@ jobs:
         id: buildx
         uses: docker/setup-buildx-action@v1
 
-      - name: Cache Docker layers
-        uses: actions/cache@v2
-        with:
-          path: /tmp/.buildx-cache
-          key: ${{ runner.os }}-buildx-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-buildx-
-
       - name: Build the thesis
         uses: docker/build-push-action@v2
         with:
           push: false
           builder: ${{ steps.buildx.outputs.name }}
           tags: release-${{ steps.environment.outputs.sha_short }}
-          cache-from: type=local,src=/tmp/.buildx-cache
-          cache-to: type=local,dest=/tmp/.buildx-cache-new
           context: .
           outputs: .
 
-      # Temp fix
-      # https://github.com/docker/build-push-action/issues/252
-      # https://github.com/moby/buildkit/issues/1896
-      - name: Move cache
-        run: |
-          rm -rf /tmp/.buildx-cache
-          mv /tmp/.buildx-cache-new /tmp/.buildx-cache
-
       - name: Upload thesis.pdf to build artifacts
         uses: actions/upload-artifact@v1
         with: