Enable linters in CI - Shell, Python

[jamacku]

No description provided.

[github-advanced-security]

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[kdudka]

@jamacku Did the CI job actually scan anything? The list of scripts for scanning at https://github.com/openscanhub/fedora-infra/pull/59/checks#step:4:27 is empty but if I run shellcheck locally, it gives me some results:

% shellcheck containers/scripts/run_hub.sh

In containers/scripts/run_hub.sh line 4:
if [[ -e /src ]]; then
   ^-----------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In containers/scripts/run_hub.sh line 6:
    pushd /src
    ^--------^ SC3044 (warning): In POSIX sh, 'pushd' is undefined.


In containers/scripts/run_hub.sh line 16:
    popd
    ^--^ SC3044 (warning): In POSIX sh, 'popd' is undefined.


In containers/scripts/run_hub.sh line 47:
if [[ -e /src ]]; then
   ^-----------^ SC3010 (warning): In POSIX sh, [[ ]] is undefined.


In containers/scripts/run_hub.sh line 54:
    python3 -m smtpd -n -c DebuggingServer localhost:8025 &> /tmp/emails.log &
                                                          ^----------------^ SC3020 (warning): In POSIX sh, &> is undefined.

For more information:
  https://www.shellcheck.net/wiki/SC3010 -- In POSIX sh, [[ ]] is undefined.
  https://www.shellcheck.net/wiki/SC3020 -- In POSIX sh, &> is undefined.
  https://www.shellcheck.net/wiki/SC3044 -- In POSIX sh, 'popd' is undefined.

[kdudka]

As explained in person, the list of shell scripts covered by the CI is available here: https://github.com/jamacku/fedora-infra/actions/runs/8820241956/job/24213397008#step:4:28 This pull request does not change any of them, so the list of scripts to scan ended up empty.

[jamacku]