feat(owncloud): add ownCloud with MariaDB and Redis

owncloud/.env.example

@@ -0,0 +1,17 @@
+# Copy to .env and fill in. Never commit .env.
+#
+#   cp .env.example .env
+
+# Public hostname, without scheme. Also the only trusted domain.
+OWNCLOUD_DOMAIN=owncloud.example.com
+
+# Admin account, created on first start only.
+# Generate a password with: openssl rand -base64 24
+OWNCLOUD_ADMIN_USERNAME=admin
+OWNCLOUD_ADMIN_PASSWORD=
+
+# MariaDB credentials, used by the database and by ownCloud.
+DB_NAME=owncloud
+DB_USER=owncloud
+DB_PASSWORD=
+DB_ROOT_PASSWORD=