fix: [#409] replace hardcoded /opt/torrust paths with deploy_dir variable in Ansible templates

[josecelano]

Summary

Fixes #409 — Several Ansible playbook templates under templates/ansible/ were hardcoding the deployment directory as /opt/torrust instead of using the {{ deploy_dir }} variable from variables.yml. This caused deployment failures when a custom deployment directory was configured.

Changes

Phase 1: Fix fully hardcoded templates

All the following templates had vars_files: [variables.yml] added and all hardcoded /opt/torrust paths replaced with {{ deploy_dir }}:

• templates/ansible/create-tracker-storage.yml — 3 loop items
• templates/ansible/create-prometheus-storage.yml — 1 loop item
• templates/ansible/create-backup-storage.yml — 2 path: params
• templates/ansible/deploy-backup-config.yml — 4 dest: and path: params
• templates/ansible/deploy-tracker-config.yml — 2 dest: and path: params
• templates/ansible/deploy-prometheus-config.yml — 2 dest: and path: params
• templates/ansible/init-tracker-database.yml — 2 path: params
• templates/ansible/deploy-caddy-config.yml — 6 loop items + dest: + path:

Phase 2: Fix inline-variable templates

• templates/ansible/run-compose-services.yml — Removed inline vars: deploy_dir: /opt/torrust; added vars_files: [variables.yml]
• templates/ansible/deploy-compose-files.yml — Removed inline vars: remote_deploy_dir: /opt/torrust; added vars_files: [variables.yml]; renamed all remote_deploy_dir references to deploy_dir

Phase 3: Update comments

Updated inline comments in modified templates to reference {{ deploy_dir }} instead of /opt/torrust example paths.

Acceptance Criteria

• No playbook task in templates/ansible/ uses a hardcoded /opt/torrust path in path:, dest:, or loop items
• All playbooks that reference the deployment directory load variables.yml via vars_files
• The variable name deploy_dir is used consistently (no remote_deploy_dir or other aliases)
• Playbooks that previously had inline vars: blocks for the deploy directory no longer define it inline
• The default behavior (with deploy_dir: /opt/torrust) is unchanged
• YAML linter passes (cargo run --bin linter yaml)
• Markdown linter passes
• Spell checker passes

[josecelano]

ACK 7365df3