Several tests need to install an out-of-date package
to test whether upgrades occur successfully, so this
commit refactors out the generation of the test package.
Also, factor out things like the name and path of the
test package so that is more maintainable should the
target test package (currently `zsh`) ever need to
change.
Instead of relying on a broken-ish installation
of an older package from FreeBSD 11, hand-generate
a package named `zsh` with no contents and a version
number of `0`. It can be installed on any architecture
and any revision of FreeBSD sucessfully, and it will
always be eligible for upgrade.
Including small filesize out-of-date package from
FreeBSD 11 package repository, because FreeBSD 11 is
currently EOL. This test might fail at some point in the
future if the pkg utility in a FreeBSD version > 14
makes breaking changes that prevents it from installing
older package formats.
If that occurs, the fix is to replace
`files/freebsd-release-manifests-20210413__FreeBSD_11.pkg`
with the version of freebsd-release-manifests from the oldest
non-breaking release of FreeBSD, and update the
references to it in tasks/main.yml accordingly.
These tests should be skip/docker, but the test
playbook also redundantly checked whether it was
running in a docker container.
Checking whether `ansible_facts.distribution` is
`FreeBSD` is really sufficient to be sure whether
the test is running in an environment that supports
the `pkgng` module.
Had been using bash package, because it's not
likely to disappear from the package repository
any time soon. Turns out that bash is already
installed on the Ansible community.general
FreeBSD CI VM image, which makes the test fail.
Zsh probably isn't going away any time soon,
either, and likely won't be installed on the
CI image.
