add Terraform + Ansible infrastructure for GCP deployment

Provisions e2-micro VM (us-east1-b, free tier) with static IP, SSH and
web firewall rules, Docker + Caddy startup script, and IAM bindings for
Firestore and GCS access via ADC. Imports existing drb-calls bucket and
c2-server Firestore database into state. Ansible roles handle first-time
setup (swap, docker group) and all subsequent deploys via rsync + docker
compose, with secrets managed via Ansible Vault. DNS stays on AWS Route 53.

infra/ansible/group_vars/all.yml.example

@@ -0,0 +1,9 @@
+# Copy to group_vars/all.yml — safe to commit (no secrets here).
+
+domain: example.com           # must match Terraform var.domain
+app_dir: /opt/drb
+ssh_user: drb
+
+# Path to the local repo root on your machine (used for rsync).
+# Trailing slash is intentional — rsync copies contents, not the folder itself.
+local_repo_path: "/path/to/Version 5C/Server/"