Add hostAliases support for Triggerer in helm chart

[HassanAlahmed]

Adding support to append extra hosts to the /etc/hosts file in the triggerer pod.

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[boring-cyborg]

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[hussein-awala]

The change looks good and safe, LGTM

[boring-cyborg]

Awesome work, congrats on your first merged pull request! You are invited to check our Issue Tracker for additional contributions.

[jedcunningham]

Thanks @HassanAlahmed! Congrats on your first commit 🎉