helps to put the backslash there

Author: NattyNarwhal

.github/actions/configure-gentoo/action.yml

@@ -76,7 +76,7 @@ runs:
           --with-config-file-scan-dir=/etc/php.d \
           ${{ inputs.skipSlow == 'false' && '--with-pdo-dblib' || '' }} \
           --enable-werror \
-          ${{ inputs.configurationParameters }}
+          ${{ inputs.configurationParameters }} \
           || (echo "::group::config.log"
           cat config.log
           echo "::endgroup::"