* fix(tailscale-addon): fix DNS check and keyrings directory issues
- Source /etc/os-release instead of grep to handle quoted values properly
- Use VERSION_CODENAME variable instead of VER for correct URL
- Add fallback DNS resolution methods (host, nslookup, getent) when dig is missing
- Create /usr/share/keyrings directory if it doesn't exist
- Skip DNS check gracefully when no DNS tools are available
Fixes installation failures with 'dig: command not found' and
'No such file or directory' for keyrings path
* Update tools/addon/add-tailscale-lxc.sh
Co-authored-by: Chris <punk.sand7393@fastmail.com>
* Update tools/addon/add-tailscale-lxc.sh
Co-authored-by: Chris <punk.sand7393@fastmail.com>
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Co-authored-by: Chris <punk.sand7393@fastmail.com>
