CI: Fix ccache status output for workflow jobs

CCache configuration path was configurable until the CI script cleanup
(as scripts were still intended to be used locally then), which is not
needed anymore.

.github/actions/build-obs/action.yaml

@@ -101,8 +101,6 @@ runs:
     - name: Create Summary 📊
       if: contains(fromJSON('["Linux", "macOS"]'), runner.os)
       shell: zsh --no-rcs --errexit --pipefail {0}
-      env:
-        CCACHE_CONFIGPATH: ${{ inputs.workingDirectory }}/.ccache.conf
       run: |
         : Create Summary 📊