ci: Use optimized Debug build type in test-each-commit

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
           git config user.name "CI"
       - run: |
           sudo apt-get update
-          sudo apt-get install clang ccache build-essential cmake ninja-build pkgconf python3-zmq libevent-dev libboost-dev libsqlite3-dev systemtap-sdt-dev libzmq3-dev qt6-base-dev qt6-tools-dev qt6-l10n-tools libqrencode-dev -y
+          sudo apt-get install clang mold ccache build-essential cmake ninja-build pkgconf python3-zmq libevent-dev libboost-dev libsqlite3-dev systemtap-sdt-dev libzmq3-dev qt6-base-dev qt6-tools-dev qt6-l10n-tools libqrencode-dev -y
       - name: Compile and run tests
         run: |
           # Run tests on commits after the last merge commit and before the PR head commit