Your CI server should be running a stack very similar to production, but there are excellent reasons to use SQLite/H2/etc. in dev.
Being able to do a "git clone foo; cd foo; do my job" is a great way to start working, especially if you have struggled with front-end stylists using real data and back-end services, or any other specialised, possibly short-term, experts who are working on your project and don't have a need to learn basic db admin skills.
Never mind if you use RAC in production - you're going to make some concessions in your dev environment.
Being able to do a "git clone foo; cd foo; do my job" is a great way to start working, especially if you have struggled with front-end stylists using real data and back-end services, or any other specialised, possibly short-term, experts who are working on your project and don't have a need to learn basic db admin skills.
Never mind if you use RAC in production - you're going to make some concessions in your dev environment.