Bootstrap testfin OS with silverblue-main base and Project Bluefin integrations

[Copilot]

Transform finpilot template into testfin: a custom bootc OS using Fedora Silverblue as the base with Project Bluefin's common layer and Homebrew integration.

Changes

Base image: Switch from ghcr.io/ublue-os/bluefin:stable to ghcr.io/ublue-os/silverblue-main:stable

Project Bluefin integration (distroless pattern):

• Import common layer (ujust completions, udev rules, GNOME extensions)
• Import brew layer (Homebrew + systemd services)
• Use direct COPY --from= instead of intermediate FROM stages
• Single cp -avf command replaces rsync operations

Containerfile:

FROM scratch AS ctx
COPY build /build
COPY custom /custom
COPY --from=ghcr.io/projectbluefin/common:latest /system_files/shared /files
COPY --from=ghcr.io/projectbluefin/brew:latest /system_files /files

Build script (build/10-build.sh):

# Copy all Project Bluefin files at once
cp -avf /ctx/files/. /

# Enable Homebrew services
systemctl enable brew-setup.service brew-upgrade.timer brew-update.timer

Repository rename: Update all references from "finpilot" to "testfin" across:

• Containerfile, Justfile, README.md, artifacthub-repo.yml
• custom/ujust/README.md, .github/workflows/clean.yml, AGENTS.md

Documentation: Add "What Makes testfin Different" section documenting base image, integrations, and runtime package management approach.

Pattern follows projectbluefin/distroless implementation.

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:

• https://api.github.com/repos/ublue-os/silverblue-main/releases/latest
  • Triggering command: /usr/bin/curl curl -s REDACTED (http 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)

Original prompt

Use @projectbluefin/finpilot as a template, name the OS the repository name. Ensure the entire operating system is bootstrapped. Ensure all github actions are enabled and running. Ensure the README has the github setup instructions for cosign and the other steps required to finish the task.

Base this on @ublue-os/silverblue-main as the base image, and add the @projectbluefin/common and @projectbluefin/brew containers as per their instructions.

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