Merge pull request #209 from seqan/fix/macos_ci

fix: ci: allow brew to overwrite sym links

Author: h-2

.github/workflows/ci_macos.yml

@@ -44,10 +44,10 @@ jobs:
         uses: Homebrew/actions/setup-homebrew@master
 
       - name: Install ccache
-        run: brew install ccache
+        run: brew install --overwrite ccache
 
       - name: Install compiler ${{ matrix.cxx }}
-        run: brew install gcc@$(echo "${{ matrix.cxx }}" | sed "s/g++-//g")
+        run: brew install --overwrite gcc@$(echo "${{ matrix.cxx }}" | sed "s/g++-//g")
 
       - name: Load ccache
         uses: actions/cache@v2