Add OPENSEARCH_TMPDIR to systemd service

Description

This PR adds OPENSEARCH_TMPDIR environment variable to the wazuh-indexer.service systemd unit and has it pointing to /var/log/wazuh-indexer/tmp such that /tmp and /var/tmp mount options such as noexec don't affect the service's initialization.

Issues Resolved

Resolves: https://github.com/wazuh/wazuh-packages/issues/1539

Check List

[x] New functionality includes testing.
- [x] All tests pass
[ ] New functionality has been documented.
- [ ] New functionality has javadoc added
[ ] Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
[x] Commits are signed per the DCO using --signoff
[ ] Commit changes are listed out in CHANGELOG.md file (See: Changelog)
[ ] Public documentation issue/PR created

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Tested and working as expected:

[root@alma8 ~]# ls -l /var/log/wazuh-indexer/ | grep tmp
drwxr-x---. 2 wazuh-indexer wazuh-indexer      6 May 21 11:58 tmp

[root@alma8 ~]# systemctl status wazuh-indexer.service --no-pager
● wazuh-indexer.service - wazuh-indexer
   Loaded: loaded (/usr/lib/systemd/system/wazuh-indexer.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2024-05-21 11:58:20 -03; 7min ago
     Docs: https://documentation.wazuh.com
 Main PID: 10418 (java)
    Tasks: 66 (limit: 23148)
   Memory: 1.3G
   CGroup: /system.slice/wazuh-indexer.service
           └─10418 /usr/share/wazuh-indexer/jdk/bin/java -Xshare:auto -Dopensearch.networkaddress.cache.ttl=60 -Dopensearch.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch …

May 21 11:58:12 alma8 systemd-entrypoint[10418]: WARNING: System::setSecurityManager has been called by org.opensearch.bootstrap.OpenSearch (file:/usr/share/wazuh-index…h-2.13.0.jar)
May 21 11:58:12 alma8 systemd-entrypoint[10418]: WARNING: Please consider reporting this to the maintainers of org.opensearch.bootstrap.OpenSearch
May 21 11:58:12 alma8 systemd-entrypoint[10418]: WARNING: System::setSecurityManager will be removed in a future release
May 21 11:58:13 alma8 systemd-entrypoint[10418]: May 21, 2024 11:58:13 AM sun.util.locale.provider.LocaleProviderAdapter <clinit>
May 21 11:58:13 alma8 systemd-entrypoint[10418]: WARNING: COMPAT locale provider will be removed in a future release
May 21 11:58:13 alma8 systemd-entrypoint[10418]: WARNING: A terminally deprecated method in java.lang.System has been called
May 21 11:58:13 alma8 systemd-entrypoint[10418]: WARNING: System::setSecurityManager has been called by org.opensearch.bootstrap.Security (file:/usr/share/wazuh-indexer…h-2.13.0.jar)
May 21 11:58:13 alma8 systemd-entrypoint[10418]: WARNING: Please consider reporting this to the maintainers of org.opensearch.bootstrap.Security
May 21 11:58:13 alma8 systemd-entrypoint[10418]: WARNING: System::setSecurityManager will be removed in a future release
May 21 11:58:20 alma8 systemd[1]: Started wazuh-indexer.
Hint: Some lines were ellipsized, use -l to show in full.

[root@alma8 ~]# systemctl cat wazuh-indexer.service --no-pager | grep OPENSEARCH_TMPDIR
Environment=OPENSEARCH_TMPDIR=/var/log/wazuh-indexer/tmp

wazuh / wazuh-indexer