Drop Ubuntu 20.04 (Focal) support, because it's nearing its end-of-life
date. By doing so, we can remove several workarounds and notices we had
in place for this version, and most importantly, remove the pin to our
vendored PyMuPDF package.
Refs #1018
Refs #965
Starting with Debian Trixie, `apt secure` relies on `sqv` to do its verification, which doesn't support the GPG keybox database format.
At the same time, using the standard PGP base64 format makes the verification fail for versions of `apt secure` which relies on `gpg`, as the subkey isn't detected there.
Fixes#1055
Unreleased Fedora versions may refer to themselves as "rawhide", instead
of their version (e.g., "41"). For this reason, we should try and
replace the "rawhide" string with the proper Fedora version.
Fedora 41 has a newer dnf interface (dnf v5), and the config-manager
plugin that we use is not compatible with it. Suggest running it with
`dnf-3` instead, which is present in all Fedora versions.
Zsh users that attempt to run the following command in our Ubuntu/Debian
installation instructions:
echo deb [signed-by=/etc/apt/keyrings/fpf-apt-tools-archive-keyring.gpg] \
https://packages.freedom.press/apt-tools-prod ${VERSION_CODENAME?} main \
| sudo tee /etc/apt/sources.list.d/fpf-apt-tools.list
encounter the following error:
zsh: no matches found:
[signed-by=/etc/apt/keyrings/fpf-apt-tools-archive-keyring.gpg]
Quote this command to ensure compatibility with other shells, and update
our CI checks.
Fixes#805
Create a new GitHub Actions workflow which aims to continuously test our
official installation instructions. The way we do it is the following:
1. Create two jobs, one for the Debian-based distros, and one for Fedora
ones.
2. Copy the instructions from INSTALL.md into each job.
3. Create a matrix that runs the installation jobs in parallel, for each
supported distro and version.
The jobs will run only on 00:00 UTC, and not on every PR, since it
wouldn't make sense otherwise.
Fix#653
