deb.yml builds the punktfunk-web .output in the rust-ci image, but that image had no bun
(only ci.yml's web/docs jobs use the oven/bun image) -> "bun: not found". Bake bun (+ unzip
for its installer) into ci/rust-ci.Dockerfile, and bootstrap it in the deb web step too so the
job is green against the previous image (docker.yml rebuild lag) — mirroring the rpm.yml fix.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
cd395f0c22