Add enhanced configuration and Docker Compose support for WriteFreely (#2)

* Update ini configuration. Add docker-compose examples
* remove unneeded network config
* Add docker compose instructions
* Correct sqlite location
* do not wait for MariaDB
* Use writefreely user
* Add .env instructions for docker compose
* Retry init if database is not ready
* Ignore production directories
* Improve init checks
* refactor init script

---------

Co-authored-by: Germán Martín <gmartin@gmartin.net>

.env.mariadb

@@ -0,0 +1,38 @@
+
+# General Configuration
+WRITEFREELY_BIND_PORT=8080
+WRITEFREELY_BIND_HOST=0.0.0.0
+WRITEFREELY_SITE_NAME="My Blog"
+WRITEFREELY_SITE_DESCRIPTION="My fancy blog"
+
+# Database Configuration
+MARIADB_USER=writefreely
+MARIADB_PASSWORD=changeme
+MARIADB_DATABASE=writefreely
+MARIADB_ROOT_PASSWORD=changeme
+
+WRITEFREELY_DATABASE_DATABASE=mysql
+WRITEFREELY_DATABASE_USERNAME=${MARIADB_USER}
+WRITEFREELY_DATABASE_PASSWORD=${MARIADB_PASSWORD}
+WRITEFREELY_DATABASE_NAME=${MARIADB_DATABASE}
+WRITEFREELY_DATABASE_HOST=writefreely-db
+WRITEFREELY_DATABASE_PORT=3306
+
+
+# Application Settings
+WRITEFREELY_HOST=
+WRITEFREELY_SINGLE_USER=true
+WRITEFREELY_OPEN_REGISTRATION=false
+WRITEFREELY_MIN_USERNAME_LEN=4
+WRITEFREELY_MAX_BLOG=4
+WRITEFREELY_FEDERATION=true
+WRITEFREELY_PUBLIC_STATS=true
+WRITEFREELY_PRIVATE=false
+WRITEFREELY_LOCAL_TIMELINE=true
+WRITEFREELY_USER_INVITES=
+
+# Writefreely Users
+WRITEFREELY_ADMIN_USER=admin
+WRITEFREELY_ADMIN_PASSWORD=changeme
+WRITEFREELY_WRITER_USER=
+WRITEFREELY_WRITER_PASSWORD=