MINIFICPP-2187 Free up space on CI runners for CentOS job

Signed-off-by: Ferenc Gerlits <[email protected]>
This closes #1632

.github/workflows/ci.yml

@@ -289,6 +289,16 @@ jobs:
           sudo apt update
           sudo apt install -y ccache
           echo "PATH=/usr/lib/ccache:$PATH" >> $GITHUB_ENV
+      - id: free_disk_space
+        run: |
+          # We can gain additional disk space on the Ubuntu runners thanks to these suggestions:
+          # https://github.com/actions/runner-images/issues/2840#issuecomment-790492173
+          # https://github.com/actions/runner-images/issues/2606#issuecomment-772683150
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
+          sudo rm -rf "/usr/local/share/boost"
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
       - id: build
         run: |
           if [ -d ~/.ccache ]; then mv ~/.ccache .; fi