Trying a workaraound for dotnet bug

https://github.com/actions/setup-dotnet/issues/155

.github/workflows/ci-suite.yml

@@ -166,6 +166,9 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v1
 
+    - name: Clean package cache as a temporary workaround for actions/setup-dotnet#155
+      run: dotnet clean && dotnet nuget locals all --clear
+
     - name: Build
       run: dotnet build -c ${{ matrix.configuration }}
 
@@ -223,6 +226,9 @@ jobs:
         TEMP_GITHUB_REF="${{ github.event.ref }}"
         echo "TGS4_GITHUB_REF=${TEMP_GITHUB_REF##*/}" >> $env:GITHUB_ENV
 
+    - name: Clean package cache as a temporary workaround for actions/setup-dotnet#155
+      run: dotnet clean && dotnet nuget locals all --clear
+
     - name: Run Integration Test
       run: |
         cd tests/Tgstation.Server.Tests