Add podman support

.gitignore

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-/piwigo-data/
+/piwigo-data
+/podman-quadlet/piwigo-data
 /.env

README.md

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 An alpine based container to easily deploy piwigo !
 
+Check the [podman README](./podman-quadlet/README.md) if you would rather use podman.
+
 ## Usage
 
 ### Starting the container

podman-quadlet/README.md

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+# Piwigo podman (Quadlet)
+
+## Requirements
+
+- systemd
+- podman
+
+## Usage
+
+Create `/etc/containers/systemd/piwigo/` and copy each quadlet units files in it.
+
+```
+/etc/containers/systemd/piwigo/
+    ├── piwigo-db.container
+    ├── piwigo.container
+    └── piwigo.network
+```
+
+Reload systemd units and start the service :
+
+```sh
+sudo systemctl daemon-reload
+sudo systemctl start piwigo.service
+``` 
+
+### Changing the exposed port :
+
+Edit `piwigo.container` :
+
+```diff
+- PublishPort=8080:80
++ PublishPort=12345:80
+```
+
+### Changing bind-mounts
+
+Bind mounts are links between the host filesystem and the containers.  
+Systemd placeholder are valid in quadlets, `%h` is match the container user home (`/root/`) see [the documentation](#documentation)
+
+Edit `piwigo.container` :
+
+```diff
+- Volume=./piwigo-data/piwigo:/var/www/html/piwigo:z
+- Volume=./piwigo-data/scripts:/usr/local/bin/scripts:z
++ Volume=%h/PiwigoPod/piwigo:/var/www/html/piwigo:z
++ Volume=%h/PiwigoPod/scripts:/usr/local/bin/scripts:z
+```
+
+And edit `piwigo-db.container` :
+
+```diff
+- Volume=./piwigo-data/mysql:/var/lib/mysql:z
++ Volume=%h/PiwigoPod/mysql:/var/lib/mysql:z
+```
+
+### Updating 
+
+Stop and restart your containers, podman should pull an updated image automatically.
+
+```sh
+sudo systemctl stop piwigo.service piwigo-db.service
+sudo systemctl daemon-reload
+sudo systemctl start piwigo.service
+```
+
+### Diagnosing errors 
+
+Access the systemd journal `sudo journalctl -eu piwigo.service`, most common errors are permision issues.  
+Ensure that your volume is in a valid location and has read and write permisions.
+
+### Documentation 
+
+- [Quadlet unit documentation](https://docs.podman.io/en/latest/markdown/podman-systemd.unit.5.html)
+- [Volume documentation](https://docs.podman.io/en/v4.4/markdown/options/volume.html)
+- [System unit placeholder table](https://www.freedesktop.org/software/systemd/man/latest/systemd.unit.html#Specifiers)

podman-quadlet/piwigo-db.container

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+# Piwigo database container
+[Container]
+Environment=MARIADB_RANDOM_ROOT_PASSWORD=true MARIADB_USER=piwigodb_user MARIADB_DATABASE=piwigodb MARIADB_PASSWORD=PASSWORD
+Image=docker.io/library/mariadb:lts
+Network=piwigo.network
+Volume=./piwigo-data/mysql:/var/lib/mysql:z
+
+[Service]
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

podman-quadlet/piwigo.container

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+# Piwigo NGINX PHP-FPM container
+[Unit]
+Requires=piwigo-db.service
+After=piwigo-db.service
+
+[Container]
+Image=ghcr.io/piwigo/piwigo:latest
+Network=piwigo.network
+PublishPort=8080:80
+Volume=./piwigo-data/piwigo:/var/www/html/piwigo:z
+Volume=./piwigo-data/scripts:/usr/local/bin/scripts:z
+
+[Install]
+WantedBy=multi-user.target

podman-quadlet/piwigo.network

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+# Piwigo Network
+[Network]