chore(linter): fix hadolint warnings

[pstoeckle]

I used hadolint on the generated alpine/debian Dockerfiles, and fixed some problems.
I did NOT fix things like

• DL3008, i.e., python3.11-nodejs20.Dockerfile:10 DL3008 warning: Pin versions in apt get install. Instead of `apt-get install <package>` use `apt-get install <package>=<version>`
• DL4006 python3.11-nodejs20.Dockerfile:14 DL4006 warning: Set the SHELL option -o pipefail before RUN with a pipe in it. If you are using /bin/sh in an alpine image or if your shell is symlinked to busybox then consider explicitly setting your SHELL to /bin/ash, or disable this check
• DL3013 i.e., python3.11-nodejs20.Dockerfile:34 DL3013 warning: Pin versions in pip. Instead of `pip install <package>` use `pip install <package>==<version>` or `pip install --requirement <requirements file>`