chore: more repo cleanup

[inffy]

Align with bluefin ublue-os/bluefin#3477

Not sure what is happening with the Beta builds, although tomorrow is the release so those won't be available for long anyway

[Copilot]

Pull Request Overview

This PR consolidates Aurora's build process and aligns it with Bluefin's build infrastructure changes. It simplifies the container build by removing the multi-stage approach and streamlining package installations with isolated repo enablement.

Key changes:

• Merges multi-stage container build into single-stage with conditional DX build
• Consolidates package installations to use isolated repo enablement pattern
• Removes standalone repo configuration files in favor of inline repo setup during builds

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
system_files/shared/etc/yum.repos.d/tailscale.repo	Removed static Tailscale repo config; now installed via inline repo setup
system_files/dx/etc/yum.repos.d/vscode.repo	Removed static VSCode repo config; now installed via inline repo setup
system_files/dx/etc/yum.repos.d/docker-ce.repo	Removed static Docker repo config; now installed via inline repo setup
build_files/shared/clean-stage.sh	Enhanced cleanup to use dnf clean all, comprehensive /var and /boot cleanup, and added bootc container lint
build_files/shared/build.sh	Moved Just file consolidation, removed call to deleted base-image-changes.sh, integrated DX build conditionally
build_files/shared/build-dx.sh	Simplified to call consolidated dx/00-dx.sh, removed redundant cleanup and ostree commit
build_files/dx/09-cleanup-dx.sh	Deleted; systemd enablement and repo cleanup moved to dx/00-dx.sh
build_files/dx/04-override-install-dx.sh	Deleted; ls-iommu installation moved elsewhere or removed
build_files/dx/00-dx.sh	Consolidated all DX setup including package lists, Docker/VSCode inline repo installation, service enablement, and repo cleanup
build_files/base/18-workarounds.sh	Removed commented-out atheros-firmware workaround section
build_files/base/07-base-image-changes.sh	Deleted; all base image branding and configuration moved to 05-override-install.sh
build_files/base/05-override-install.sh	Consolidated base image changes including wallpaper setup, Ptyxis config, gschema compilation, and Samba configuration
build_files/base/04-packages.sh	Moved Tailscale to inline repo installation, updated OpenRazer installation to use isolated repo pattern, removed sunshine from exclusions
Justfile	Removed multi-stage target logic, added IMAGE_FLAVOR build arg for conditional DX build
Containerfile	Removed multi-stage build (dx stage), added IMAGE_FLAVOR arg, changed to tmpfs mounts, added /opt symlink setup

[renner0e]

booted an i mage with this and nothing was missing. LGTM