Rerender 06-matrix-images to fix Python installs#18
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Replace the tarball download of Quarto with an apt install from the
Posit Open repository (`dl.posit.co/public/open/`). This sidesteps the
`${TARGETARCH}` expansion bug in #18 — where the PR swapped
`linux-amd64` for `linux-${TARGETARCH}` but the final stage did not
declare `ARG TARGETARCH`, so the URL expanded to
`...-linux-.tar.gz` and returned 404.
Why apt instead of patching the tarball URL:
- `quarto` is published as a multi-arch deb (amd64 + arm64) to the
Posit Open repo on both `jammy` and `noble`, so the install works
uniformly without URL construction.
- The base image already runs `setup.deb.sh` for the Pro repo; adding
the Open repo is a one-liner that mirrors that pattern.
- No tarball extraction, no `TARGETARCH` juggling, no stale mirror
concerns.
The `quarto` deb installs the binary to `/opt/quarto/bin/quarto` and
symlinks it into `/usr/local/bin/quarto` via its postinst script, so
TinyTeX is installed via that path. `xz-utils` is installed
explicitly because the TinyTeX tarball is `.tar.xz` and the Ubuntu
24.04 base does not include it.
Goss tests now assert the apt-installed Quarto package at the pinned
version and the presence of the `/opt/quarto/bin/quarto` binary,
replacing the previous `/opt/quarto/${QUARTO_VERSION}` file check
that no longer applies.
Supersedes #18.
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