[charmed_postgresql] Add Charmed PostgreSQL support

[acsgn]

Example output of the plugin can be seen at https://drive.google.com/drive/folders/1t1QOwzqwFTv140xvpaRpB5-kqRPOYth5?usp=sharing

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[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo yum install -y dnf-plugins-core on RHEL 8
• sudo dnf install -y dnf-plugins-core on Fedora
• dnf copr enable packit/sosreport-sos-3651
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.

[arif-ali]

We probably want to make the same change with other places too

[arif-ali]

@acsgn can you rebase to main please as the centos-stream 8 was EOL'd and now the CI doesn't work on those. This was just merged, thanks

[arif-ali]

looks good overall

a heads up, we have a new PR (#3648) that we have been working on, that allows you to run a command as a user without using su or runuser. You could potentially rework those bits in this code, and utilise that feature once that is merged.

Furthermore, we prefer that any PR that comes through is squashed before we merge.

[acsgn]

@arif-ali I believe we should move the chdir to under the runas. Currently, runas overrides the user's specification.

sos/sos/utilities.py

Lines 234 to 239 in 91c7c54

	if (chdir):
	os.chdir(chdir)
	if runas:
	os.setgid(pwd.getpwnam(runas).pw_gid)
	os.setuid(pwd.getpwnam(runas).pw_uid)
	os.chdir(pwd.getpwnam(runas).pw_dir)

[arif-ali]

@arif-ali I believe we should move the chdir to under the runas. Currently, runas overrides the user's specification.

sos/sos/utilities.py

Lines 234 to 239 in 91c7c54

	if (chdir):
	os.chdir(chdir)
	if runas:
	os.setgid(pwd.getpwnam(runas).pw_gid)
	os.setuid(pwd.getpwnam(runas).pw_uid)
	os.chdir(pwd.getpwnam(runas).pw_dir)

good call and thanks for noticing that, I'll get that resolved in another PR

[arif-ali]

based on internal discussions and testing, this looks good now

[pmoravec]

It seems charmed-postgresql is available on many distributions, per https://snapcraft.io/charmed-postgresql, but since "Users by distribution" shows just Ubuntu, we can have just UbuntuPlugin until somebody wants otherwise.