Read $DBHOST directly within the test application.

Also no need to force a rebuild.

frameworks/D/vibed/setup.sh

@@ -2,12 +2,10 @@
 
 fw_depends dlang dub
 
-sed -i 's|127.0.0.1|'"${DBHOST}"'|g' source/app.d
-
 # Clean any files from last run
 rm -f fwb
 rm -rf .dub
 
-dub build --force
+dub build
 
 ./fwb &