LOG-4532: Install journalctl into Docker image

[xperimental]

This PR installs the systemd package into the resulting Docker image, so that the journalctl tool is available again.

Currently the following error message can be observed in OpenShift Logging when running vector as the collector in 5.8:

ERROR source{component_kind="source" component_id=raw_journal_logs component_type=journald component_name=raw_journal_logs}: vector::internal_events::journald: Error starting journalctl process. error=journalctl failed to execute: No such file or directory (os error 2) error_type="command_failed" stage="receiving" internal_log_rate_limit=true

Refs https://issues.redhat.com/browse/LOG-4532

[openshift-ci-robot]

@xperimental: This pull request references LOG-4532 which is a valid jira issue.

In response to this:

This PR installs the systemd package into the resulting Docker image, so that the journalctl tool is available again.

Currently the following error message can be observed in OpenShift Logging when running vector as the collector in 5.8:

ERROR source{component_kind="source" component_id=raw_journal_logs component_type=journald component_name=raw_journal_logs}: vector::internal_events::journald: Error starting journalctl process. error=journalctl failed to execute: No such file or directory (os error 2) error_type="command_failed" stage="receiving" internal_log_rate_limit=true

Refs https://issues.redhat.com/browse/LOG-4532

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: xperimental
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[syedriko]

/lgtm