Rebase aws-pod-identity-webhook fork to include upstream enhancements and fixes.

Process:

1. Fork upstream into personal account
2. Clone Fork

git clone git@github.com:joelddiaz/amazon-eks-pod-identity-webhook.git

3. Add upstream remote

git remote add --fetch upstream https://github.com/aws/amazon-eks-pod-identity-webhook

4. Add OpenShift remote

git remote add --fetch openshift https://github.com/openshift/aws-pod-identity-webhook.git

5. Create branch for PR

git checkout -b rebase-master master

6. Merge openshift/master into rebase-master using ours strategy

git merge -s ours openshift/master

7. Make a list of carry commits (output by merge -s ours) and cherry-picked them into rebase-master branch. Evaluate the need to carry patches based on their inclusion in upstream.