Provide Alpine agent in release CI

[sxa]

Part of nodejs/node#62764
Splitting out from the initial work done in #4390

Tasks:

• Determine whether to utilise existing decomissioned RHEL8 machine with podman or provision a new server consistent with the other dockerhosts
• Set up the machine with ansible and add to the inventory ansible: add ibm cloud docker host for alpine containers #4414
• Add xz to the alpine dockerfiles (Needed for release CI but not test) Add xz to alpine containers which is required by release machines #4422
• Ensure that the generated tarballs - and the top level directory within them - are not just called node-vXX.YY.Z-linux-x64 as that does not identify it as alpine and will likely result in a race condition when pushing the files to node-www.
• Add the firewall rules to allow the new machine to push to node-www
• Enable in the iojs+release job

[sxa]

On the "generated tarball name" topic, passing VARIATION=musl to make looks like it will do the right thing in terms of making the tarball name and top level directory have linux-x64-musl in it. We'll need to decide on whether to modify the existing linux section to pass that in (blank by default) or have a new section in the iojs+release job for Alpine which only differs by that extra variable.

[richardlau]

On the "generated tarball name" topic, passing VARIATION=musl to make looks like it will do the right thing in terms of making the tarball name and top level directory have linux-x64-musl in it. We'll need to decide on whether to modify the existing linux section to pass that in (blank by default) or have a new section in the iojs+release job for Alpine which only differs by that extra variable.

If modifying the existing section we'd need to be careful that "blank by default" doesn't result (for the usual Linux x64 builds) in e.g. linux-x64-.tar.* (i.e. an empty suffix).

[sxa]

we'd need to be careful that "blank by default" doesn't result (for the usual Linux x64 builds) in e.g. linux-x64-.tar.* (i.e. an empty suffix).

Looks ok based on a quick test 👍🏻

[sxa]

I've floated a discussion with the release WG to see if anyone there (as the users) would have a strong feeling on it, but otherwise we can progress this as a Build WG item.