Fix: pin stow to version 2.3.1

[AObuchow]

Stow recently released version 2.4.0, which does not allow stowing absolute symbolic links. As a temporary workaround, this PR downgrades stow back to version 2.3.1.

Stow is being downloaded from a GNU mirror, and then verified using the official GNU keyring (see the bottom of https://ftp.gnu.org/README). We remove the GNU gpg related files once we're done with them.

Unfortunately, the binary of stow is not available for direct usage, so stow is built and then moved to /usr/bin/ so that it is available on $PATH to be used for the rest of the UBI & UDI builds (moving stow to /usr/local/bin/ didn't seem to put it on $PATH).

Fixes eclipse-che/che#22957

[svor]

lgtm

[openshift-ci]

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[AObuchow]

@ibuziuk @SDawley any thoughts on this? My only nitpick with this PR is the addition of make to the ubi. If there are no complaints, I'll have this merged as it's required to fix the UDI builds, and is a blocker for #171

[SDawley]

@AObuchow So long as this is the upstream solution, looks good to me.
curl won't work downstream though.

[AObuchow]

@AObuchow So long as this is the upstream solution, looks good to me. curl won't work downstream though.

Sounds good :) Downstream, we are manually building stow from sources. Currently, it seems like the version of stow being git cloned downstream is old so this issue hasn't arisen downstream. However, we might have to manually pin the commit to use for stow downstream if that commit is being automatically updated.

[AObuchow]

Looks like I messed up when copying over the /usr/share/ files 😅 as stow is still looking for them in /tmp/.../build/share/

Will look into this further tomorrow.