Add new fdroid role to host custom apks

roles/fdroid/README.md

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+# fdroid - F-Droid Custom APK Repository
+
+Deploys an [F-Droid](https://f-droid.org/) repository server using [austozi/fdroidserver](https://github.com/austozi/docker-fdroidserver) to host custom APKs for family devices.
+
+## Configuration
+
+### Required Variables
+
+Set in inventory or vault:
+
+```yaml
+fdroid_keystore_password: "your-secure-password-here"  # Min 12 chars
+```
+
+### Optional Variables
+
+See [defaults/main.yml](defaults/main.yml) for all configuration options.
+
+Key settings:
+
+```yaml
+fdroid_version: "26.2.1"
+fdroid_port: 8070
+fdroid_repo_url: "https://apk.jokester.fr/repo"
+fdroid_repo_name: "F-Droid Repository"
+fdroid_repo_description: "Custom APK repository"
+fdroid_update_interval: "12h"
+
+# Nginx reverse proxy
+fdroid_nginx_enabled: false
+fdroid_nginx_hostname: apk.nas.local
+```
+
+## Usage
+
+### Adding APKs
+
+```bash
+scp my-app.apk jokester@andromeda:/opt/podman/fdroid/data/repo/
+```
+
+The container automatically re-runs `fdroid update` every `fdroid_update_interval` (default: 12h) to regenerate the signed index.
+
+To trigger an immediate update:
+
+```bash
+ssh jokester@andromeda "podman exec fdroid-server fdroid update -c"
+```
+
+### F-Droid Client Setup
+
+On family phones, open F-Droid and add a new repository:
+
+- **Repository URL:** `https://apk.jokester.fr/repo`
+- Accept the fingerprint on first connection
+
+### Keystore Backup
+
+The signing keystore at `{{ podman_projects_dir }}/fdroid/data/keystore.p12` is critical. If lost, all clients must re-add the repository. Back it up.
+
+## Architecture
+
+- **Container**: `austozi/fdroidserver` (Apache + fdroidserver + Android build-tools)
+- **Storage**: Persistent data directory for keystore, config, metadata, and APKs
+- **Networking**: Localhost binding, nginx reverse proxy for HTTPS
+- **Index updates**: Automatic on configurable interval
+
+## Dependencies
+
+- podman
+- nginx (if `fdroid_nginx_enabled: true`)