Verifying artifact signature with a default signing key

Enable Remote Engines to use default signing keys to verify artifact signatures.

If you have configured the engine to use your custom signing keys, ignore this section.

Procedure

Do the following depending on the version of your engine:

If your engine is v2.12.0 and onwards, run this KARAF command:
```
feature:uninstall talend-job-server-signature-verifier-disabler
```
This command uninstalls the Karaf talend-job-server-signature-verifier-disabler feature to enable Job signature validation.
If you are using an older engine version, in the <RemoteEngineInstallationDirectory>/etc/org.talend.ipaas.rt.jobserver.client.cfg file, set the job.signature.verifying parameter to be true and save the file.

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