Feat: Add GCP github runner config and GCP image build config.

[kotaldav]

This PR replace the infrastructure for AWS Github runner with Infrastructure for GCP-based Github runner. It includes a Packer configuration for creating GCP Image automatically and then Terraform infrastructure with starting scripts as and Github actions script update to run the Github runner on GCP.

Checklist:

• [ ] Fill environmental parameters for Packer build in packer_runner_image/variables.pkrvars.hcl file
• [ ] Run Packer build for GCP image creation
• [ ] Fill environmental parameters including the name of the image created by Packer in terraform.tfvars
• [ ] Test Github Actions build pipeline