Add devigo deployment role for mini-vps production environment

- Created comprehensive devigo Ansible role with Podman Quadlet support
- Deployed devigo-site container (Hugo + nginx) via systemd
- Deployed devigo-decap-oauth OAuth2 proxy for Decap CMS
- Integrated with Caddy reverse proxy for HTTPS

Services deployed:
- devigo.no (apex domain, primary)
- www.devigo.no (redirects to apex)
- decap.jnss.me (OAuth proxy)

Key features:
- REGISTRY_AUTH_FILE environment for Podman GHCR authentication
- TRUSTED_ORIGINS (plural) for decapcms-oauth2 multi-origin support
- JavaScript-based Decap CMS initialization (eliminates YAML MIME dependency)
- nginx location block for YAML MIME type (text/yaml)
- Automated deployment via GitHub Actions CI/CD
- Comprehensive documentation with troubleshooting guide
- Architecture decision records

Fixes applied during deployment:
- OAuth origin trust validation (TRUSTED_ORIGINS vs TRUSTED_ORIGIN)
- MIME type handling strategy (location-specific vs server-level types block)
- Decap CMS initialization method (JavaScript vs link tag)
- Podman authentication for systemd services (REGISTRY_AUTH_FILE)

Testing status:
- ✅ MIME types verified (HTML, CSS, YAML all correct)
- ✅ OAuth authentication working
- ✅ Container image pulls from private GHCR
- ✅ Automated deployments functional
- ✅ Site fully operational at devigo.no

roles/devigo/tasks/setup_infrastructure.yml

@@ -0,0 +1,32 @@
+---
+# Set up Docker infrastructure for Devigo deployment
+
+- name: Create devigo deployment directory
+  file:
+    path: "{{ devigo_docker_dir }}"
+    state: directory
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Create caddy Docker network
+  containers.podman.podman_network:
+    name: caddy
+    state: present
+
+- name: Deploy docker-compose.yml
+  template:
+    src: docker-compose.yml.j2
+    dest: "{{ devigo_compose_file }}"
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Deploy Caddy configuration for devigo site
+  template:
+    src: devigo.caddy.j2
+    dest: "{{ caddy_sites_enabled_dir }}/devigo.caddy"
+    owner: root
+    group: "{{ caddy_user }}"
+    mode: '0644'
+  notify: reload caddy