It's only unhealthy for your career at that specific employer. Fortunately for tech workers in the Western hemisphere, you can always move between employers
For running applications in production, Alpine Linux is harmful and should be avoided. Getting a smaller container image is not worth trading mucl for glibc.
He was referring to sandboxing in terms of not polluting the installed packages/libraries on the server and not from a security perspective. But even from a security perspective, there are solutions to this problem like running containers as an unprivileged user using podman.
I think it's really easy to claim to be socially and environmentally conscious (especially nowadays with social media), but when you are faced with a scenario where your principles and values are put to the test, the decision you make reveals just how important to you those principles and values really are.
Indonesia has the largest population of Muslims in the world[1]. It is a Muslim country, but it is not governed by Sharia law, so it's not an Islamic country.