What I have done this week
1. Modified the PR on split multistage dockerfile. The function works fine so far.
2. Filed a draft PR on building and analyzing the multistage dockerfile. This PR is used to test the feasibility and needs modifications. So far we can get the report on each stage. More tests will be run on this function.
Plan on next week
1. More tests on the draft PR and send feedbacks to mentors.
2. Try dockerfile lock.
I am not sure if this is the best way to implement analysis on multistage dockerfile. But at least this should work.