Generate en_US.UTF-8 in base container image to remove shell locale warnings

[Copilot]

Shell sessions in containers were inheriting LANG/LC_* = en_US.UTF-8 without the locale being generated, producing repeated setlocale warnings on login. Since LXC instances are built from this image, the root cause is image-level locale provisioning.

• Base image locale provisioning

  • Updated /images/base/Dockerfile to install locales in the base layer.
  • Ensured en_US.UTF-8 is present in /etc/locale.gen.
  • Generated the locale and set system default locale to LANG=en_US.UTF-8.

• Resulting behavior

  • Containers built from this image include en_US.utf8 locale data by default.
  • Interactive shells no longer emit LC_CTYPE/LC_COLLATE warnings when environment variables are set to en_US.UTF-8.

RUN apt-get update && \
    apt-get install -y ... locales && \
    echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen && \
    locale-gen en_US.UTF-8 && \
    update-locale LANG=en_US.UTF-8 && \
    ...

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• download.proxmox.com
  • Triggering command: /usr/bin/curl curl REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[runleveldev]

LGTM