[danwee]

Step 1: gain confidence talking about containerization. Perhaps come up with a personal project that uses Docker and the public cloud. This should take you around 1-2 months top.

Step 2: Put "Docker, AWS/GCP" in your resume in your "skills" section and in the section that belongs to your current job.

Profit.

If you know about containerization then it doesn't really matter if you have learn it in your side projects or your work. If you pass the interview that means the company is comfortable with your knowledge about containers.

Your CV is whatever you want it to be (with some limitations of course). If HR is expecting to see X in your CV, you can easily put it there if you do your homework. It doesn't really matter if you didn't use X in your last job, just put it there and demonstrate in the interview how well you know X.