chore: runAsNonRoot and fix empty CRD fields

[sbernauer]

Description

Part of stackabletech/issues#876

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

• Changes are OpenShift compatible
• CRD changes approved
• CRD documentation for all fields, following the style guide.
• Helm chart can be installed and deployed operator works
• Integration tests passed (for non trivial changes)
• Changes need to be "offline" compatible
• Links to generated (nightly) docs added
• Release note snippet added

Reviewer

• Code contains useful comments
• Code contains useful logging statements
• (Integration-)Test cases added
• Documentation added or updated. Follows the style guide.
• Changelog updated
• Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

• Feature Tracker has been updated
• Proper release label has been added
• Links to generated (nightly) docs added
• Release note snippet added
• Add type/deprecation label & add to the deprecation schedule
• Add type/experimental label & add to the experimental features tracker

[xeniape]

--- FAIL: kuttl (693.73s)
    --- FAIL: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/znode_zookeeper-latest-3.9.5_openshift-false (38.08s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-true_use-client-auth-tls-true_openshift-false (107.59s)
        --- PASS: kuttl/harness/delete-rolegroup_zookeeper-3.9.5_openshift-false (80.42s)
        --- PASS: kuttl/harness/delete-rolegroup_zookeeper-3.9.4_openshift-false (80.34s)
        --- FAIL: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-true_use-client-auth-tls-true_openshift-false (311.85s)
        --- FAIL: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-false_use-client-auth-tls-false_openshift-false (153.61s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-true_use-client-auth-tls-false_openshift-false (80.04s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-false_use-client-auth-tls-true_openshift-false (91.72s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-false_use-client-auth-tls-true_openshift-false (95.20s)
        --- PASS: kuttl/harness/logging_zookeeper-3.9.4_openshift-false (65.56s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-true_use-client-auth-tls-false_openshift-false (91.13s)
        --- PASS: kuttl/harness/logging_zookeeper-3.9.5_openshift-false (67.51s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-false_use-client-auth-tls-false_openshift-false (72.80s)
        --- PASS: kuttl/harness/cluster-operation_zookeeper-latest-3.9.5_openshift-false (35.48s)
FAIL

Some tests seem to be failing, other smoke tests pass, but in case you want to take a look

[sbernauer]

Started https://testing.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/zookeeper-operator-it-custom/44/

[sbernauer]

@xeniape smoke tests passed for me:

--- PASS: kuttl (178.13s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-false_use-client-auth-tls-false_openshift-false (86.88s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-false_use-client-auth-tls-false_openshift-false (87.71s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-true_use-client-auth-tls-false_openshift-false (30.20s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-true_use-client-auth-tls-true_openshift-false (32.62s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-true_use-client-auth-tls-false_openshift-false (27.40s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-true_use-client-auth-tls-true_openshift-false (28.97s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.5_use-server-tls-false_use-client-auth-tls-true_openshift-false (28.09s)
        --- PASS: kuttl/harness/smoke_zookeeper-3.9.4_use-server-tls-false_use-client-auth-tls-true_openshift-false (33.63s)
PASS

[xeniape]

Thanks!