Initial infra setup: Terraform, Ansible, backup roles

ansible/roles/gitea-runner/templates/config.yml.j2

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+log:
+  level: info
+
+runner:
+  file: /data/.runner
+  capacity: 2          # max concurrent jobs — lower if droplet is under load
+  labels:
+    - "ubuntu-latest:docker://node:20"
+    - "ubuntu-22.04:docker://node:20"
+
+cache:
+  enabled: true
+  dir: /data/cache
+
+container:
+  network: bridge
+  force_pull: false    # reuse cached images to speed up builds

ansible/roles/gitea-runner/templates/docker-compose.yml.j2

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+services:
+  gitea-runner:
+    image: gitea/act_runner:{{ gitea_runner_version }}
+    container_name: gitea-runner
+    restart: unless-stopped
+    volumes:
+      - {{ gitea_runner_data_dir }}/config.yml:/config.yml
+      - {{ gitea_runner_data_dir }}/data:/data
+      - /var/run/docker.sock:/var/run/docker.sock  # allows runner to spin up job containers
+    environment:
+      CONFIG_FILE: /config.yml
+      GITEA_INSTANCE_URL: "{{ gitea_instance_url }}"
+      GITEA_RUNNER_REGISTRATION_TOKEN: "{{ gitea_runner_token }}"
+      GITEA_RUNNER_NAME: "{{ gitea_runner_name }}"