Release building of immutable infrastructure from the node

[lassemand]

Purpose

Building the immutable infrastructure that we are using after successfully running a release flow

https://linear.app/concordium/issue/SRE-1027/invoke-immutable-infrastructure-from-within-concordium-node

Changes

Update release.yaml with call to invoke remote dispatch job

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.