Add osc to k8s-cloud-builder image

[xmudrii]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds osc to k8s-cloud-builder image. osc is CLI for OpenBuildService (OBS) and we're going to use it for building and publishing packages. osc is available as a package in Debian repositories out of the box.

The list of packages that are added with the osc package:

The following additional packages will be installed:
  arch-test bash-completion cpio dbus debootstrap debugedit libapparmor1 libarchive-tools libarchive13
  libbytes-random-secure-perl libcrypt-random-seed-perl libcrypt-ssleay-perl libdbus-1-3 libdw1 liblua5.2-0
  libmath-random-isaac-perl libmath-random-isaac-xs-perl librpm9 librpmbuild9 librpmio9 librpmsign9 obs-build
  python3-cffi-backend python3-chardet python3-cryptography python3-jeepney python3-keyring python3-m2crypto
  python3-parameterized python3-pkg-resources python3-rpm python3-secretstorage python3-six python3-websocket rpm
  rpm-common rpm2cpio sudo wget xzdec
Suggested packages:
  libarchive1 default-dbus-session-bus | dbus-session-bus ubuntu-archive-keyring squid-deb-proxy-client rpm-i18n lrzip
  xfsprogs btrfs-progs python-cryptography-doc python3-cryptography-vectors gnome-keyring libkf5wallet-bin python3-dbus
  python3-keyrings.alt python-m2crypto-doc python3-setuptools python-secretstorage-doc alien elfutils rpmlint rpm2html
The following NEW packages will be installed:
  arch-test bash-completion cpio dbus debootstrap debugedit libapparmor1 libarchive-tools libarchive13
  libbytes-random-secure-perl libcrypt-random-seed-perl libcrypt-ssleay-perl libdbus-1-3 libdw1 liblua5.2-0
  libmath-random-isaac-perl libmath-random-isaac-xs-perl librpm9 librpmbuild9 librpmio9 librpmsign9 obs-build osc
  python3-cffi-backend python3-chardet python3-cryptography python3-jeepney python3-keyring python3-m2crypto
  python3-parameterized python3-pkg-resources python3-rpm python3-secretstorage python3-six python3-websocket rpm
  rpm-common rpm2cpio sudo wget xzdec
0 upgraded, 41 newly installed, 0 to remove and 16 not upgraded.

Special notes for your reviewer:

I have some concerns regarding the number of dependencies that are installed:

• How much is that going to affect the image size?
• How much is that going to affect the security of that image in term of number of vulnerabilities potentially affecting those packages now and in the future?

I decided to go with k8s-cloud-bulider because that's what we use in stage and release for krel. We'll extend stage and release steps with OBS workflow, so I wanted to keep the same image. Alternative is to create a new image or repurpose the kubepkg image, but I'm opening this PR to collect ideas and feedback.

Does this PR introduce a user-facing change?

Add `osc` (OpenBuildService CLI) to k8s-cloud-builder image

/assign @saschagrunert @cpanato @jeremyrickard
cc @kubernetes/release-engineering
/hold
for discussion

[cpanato]

Non-blocking question: it is OK to install the latest available or should we pin to a specific version?

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpanato, xmudrii

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[xmudrii]

Non-blocking question: it is OK to install the latest available or should we pin to a specific version?

Latest is okay because we use managed OBS instance which is frequently updated. The commands that we use shouldn’t be changed frequently or at all.

[xmudrii]

Let’s iterate on this and we can always revert if needed
/hold cancel