[release-6.6]fix(security): harden collector to run non-root (CWE-250)

[vparfonov]

Description

Enforce that the collector container runs as a fixed non-root UID (1000) with RunAsNonRoot=true. This removes unnecessary privilege from the collector workload and closes the CWE-250 (Execution with Unnecessary Privileges) finding.

Changes:

• Add RunAsUser: 1000 and RunAsNonRoot: true to the collector SecurityContext
• Apply SecurityContext to both DaemonSet and Deployment collector modes
• Update SCC from RunAsAny to MustRunAsNonRoot to enforce at the policy level that all pods using logging-scc must run as non-root
• Update tests to verify both modes now have the hardened security context

/cc
/assign @jcantrill

Links

• Depending on PR(s):
• GitHub issue:
• JIRA: LOG-9757
• Enhancement proposal:

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This pull-request has been approved by: vparfonov
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[vparfonov]

/retest-required

[openshift-ci]

@vparfonov: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-target	13e95b5	link	true	/test e2e-target
ci/prow/functional-target	13e95b5	link	true	/test functional-target

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