feat(postiz): add Postiz social media manager

quadlets/postiz/postiz-postgres.container

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+[Unit]
+Description=Postiz DB
+
+[Service]
+Restart=on-failure
+TimeoutStartSec=900
+
+[Install]
+WantedBy=default.target
+
+[Container]
+Image=docker.io/postgres:17-alpine
+ContainerName=postiz-postgres
+AutoUpdate=registry
+
+Network=
+HostName=postiz-postgres
+
+Volume=postiz-db:/var/lib/postgresql/data
+
+Environment=POSTGRES_USER=postiz-user
+Environment=POSTGRES_DB=postiz-db-local
+
+Secret=postiz-password,type=env,target=POSTIZ_PASSWORD

quadlets/postiz/postiz-redis.container

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+[Unit]
+Description=Postiz Redis
+
+[Service]
+Restart=on-failure
+TimeoutStartSec=900
+
+[Install]
+WantedBy=default.target
+
+[Container]
+Image=docker.io/redis:7.2
+ContainerName=postiz-redis
+AutoUpdate=registry
+
+Network=
+HostName=postiz-redis
+
+Volume=postiz-redis-data:/data

quadlets/postiz/postiz.container

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+[Unit]
+Description=Postiz social media management
+Requires=postiz-postgres.service
+Requires=postiz-redis.service
+After=postiz-postgres.service
+After=postiz-redis.service
+
+[Service]
+Restart=on-failure
+TimeoutStartSec=900
+
+[Install]
+WantedBy=default.target
+
+[Container]
+Image=ghcr.io/gitroomhq/postiz-app:latest
+ContainerName=postiz
+AutoUpdate=registry
+
+Network=
+HostName=postiz
+PublishPort=5000:5000
+
+Volume=postiz-config:/config
+Volume=postiz-uploads:/uploads
+
+Environment=MAIN_URL=https://postiz.example.com
+Environment=FRONTEND_URL=https://postiz.example.com
+Environment=NEXT_PUBLIC_BACKEND_URL=https://postiz.example.com/api
+
+Environment=DATABASE_URL=postgresql://postiz-user:${POSTIZ_PASSWORD}@postiz-postgres:5432/postiz-db-local
+Environment=redis://postiz-redis:6379
+Environment=BACKEND_INTERNAL_URL=http://localhost:3000
+Environment=IS_GENERAL=true
+
+Environment=STORAGE_PROVIDER=local
+Environment=UPLOAD_DIRECTORY=/uploads
+Environment=NEXT_PUBLIC_UPLOAD_DIRECTORY=/uploads
+
+Secret=postiz-password,type=env,target=POSTIZ_PASSWORD
+Secret=postiz-jwt,type=env,target=JWT_SECRET

quadlets/postiz/postiz.volume

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+[Volume]
+VolumeName=postiz-config
+VolumeName=postiz-uploads
+VolumeName=postiz-redis-data
+VolumeName=postiz-db
+