Don't cache target dir

Author: flip1995

.github/workflows/integration.yml

@@ -57,11 +57,6 @@ jobs:
       with:
         path: ~/.cargo/git
         key: ${{ runner.os }}-cargo-index
-    - name: Cache cargo build
-      uses: actions/cache@v1
-      with:
-        path: target
-        key: ${{ runner.os }}-cargo-build-target
     - name: Master Toolchain Setup
       run: bash setup-toolchain.sh
     - name: Build