New recipe: Redmine with MariaDB.

.recipes/redmine_mariadb/configs/configuration.yml

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+# = Redmine configuration file
+# The entrypoint script sets chown 999:999 and chmod 644 to this file.
+#
+# Each environment has its own configuration options.  If you are only
+# running in production, only the production block needs to be configured.
+# Environment specific configuration options override the default ones.
+#
+# Note that this file needs to be a valid YAML file.
+# DO NOT USE TABS! Use 2 spaces instead of tabs for indentation.
+
+# default configuration options for all environments
+default:
+  # Outgoing emails configuration
+  # Feel free to setup your local SMTP settings here.
+  email_delivery:
+    delivery_method: :smtp
+    smtp_settings:
+      address: 'host.docker.internal'
+      port: 25
+      enable_starttls_auto: false
+
+# specific configuration options for production environment
+# that overrides the default ones
+production:
+
+# specific configuration options for development environment
+# that overrides the default ones
+development:
+

.recipes/redmine_mariadb/configs/database.yml

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+# = Redmine database configuration file
+# The entrypoint script sets chown 999:999 and chmod 644 to this file.
+#
+# Note that this file needs to be a valid YAML file.
+# DO NOT USE TABS! Use 2 spaces instead of tabs for indentation.
+
+production:
+  adapter: mysql2
+  database: redmine
+  host: database
+  username: redmine
+  # It should be the same as in the docker-compose.yml file.
+  password: "secret-1"
+  # Use "utf8" instead of "utfmb4" for MySQL prior to 5.7.7
+  encoding: utf8mb4
+  variables:
+    # Recommended `transaction_isolation` for MySQL to avoid concurrency issues is
+    # `READ-COMMITTED`.
+    # In case of MySQL lower than 8, the variable name is `tx_isolation`.
+    # See https://www.redmine.org/projects/redmine/wiki/MySQL_configuration
+    transaction_isolation: "READ-COMMITTED"

.recipes/redmine_mariadb/configs/mysql_conf_d

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+../storage/volumes/mysql_conf_d