Default to debug builds for git based builds

Release builds will remain normal. This should make it easier to
create a stack trace from the nightly builds.

gnucash.modules

@@ -300,7 +300,7 @@
  </cmake>
 
  <cmake id="gnucash-git"
-        cmakeargs="-G 'MSYS Makefiles' -DCMAKE_FIND_ROOT_PATH=$MSYS2ROOT -DCMAKE_PREFIX_PATH=$MSYS2ROOT -DPERL_EXECUTABLE=/usr/bin/perl -DGNC_DBD_DIR=$PREFIX/lib/dbd -DHTMLHELP_DIR=$PREFIX/hh -DGTEST_ROOT=$SRCROOT/googletest/googletest -DGMOCK_ROOT=$SRCROOT/googletest/googlemock -DCOMPILE_GSCHEMAS=OFF"
+        cmakeargs="-G 'MSYS Makefiles' -DCMAKE_FIND_ROOT_PATH=$MSYS2ROOT -DCMAKE_PREFIX_PATH=$MSYS2ROOT -DPERL_EXECUTABLE=/usr/bin/perl -DGNC_DBD_DIR=$PREFIX/lib/dbd -DHTMLHELP_DIR=$PREFIX/hh -DGTEST_ROOT=$SRCROOT/googletest/googletest -DGMOCK_ROOT=$SRCROOT/googletest/googlemock -DCOMPILE_GSCHEMAS=OFF -DCMAKE_BUILD_TYPE=Debug"
 	use-ninja="False">
    <branch repo="github" module="Gnucash/gnucash.git" revision="master"
 	   checkoutdir="gnucash-git"/>