feat: add mysql config dir volume (#113)

.env.docker

@@ -1376,6 +1376,16 @@ DOCKER_DB_COMMAND="--default-authentication-plugin=mysql_native_password --old-m
 # @dottie/validate required,dir
 DOCKER_DB_HOST_DATA_PATH="${DOCKER_ALL_HOST_DATA_ROOT_PATH:?error}/db"
 
+# Path (on host system) where the [db] container will store /etc/mysql/conf.d files
+#
+# Path is relative (./some/other/path) to the compose.yaml or absolute (/some/other/path)
+#
+# MySQL / MariaDB only - PostgreSQL store the config files in ${DOCKER_DB_HOST_DATA_PATH}
+#
+# @default ${DOCKER_ALL_HOST_CONFIG_ROOT_PATH}/db
+# @dottie/validate required,dir
+DOCKER_DB_HOST_CONFIG_PATH="${DOCKER_ALL_HOST_CONFIG_ROOT_PATH:?error}/db"
+
 # Path (inside the container) where the [db] will store its data.
 #
 # Path MUST be absolute.

compose.yaml

@@ -218,6 +218,8 @@ services:
       POSTGRES_DB: "${DB_DATABASE:?error}"
     volumes:
       - "${DOCKER_DB_HOST_DATA_PATH:?error}:${DOCKER_DB_CONTAINER_DATA_PATH:?error}"
+      # MySQL / MariaDB only
+      - "${DOCKER_DB_HOST_CONFIG_PATH:?error}:/etc/mysql/conf.d/"
     ports:
       - "${DOCKER_DB_HOST_PORT:?error}:${DOCKER_DB_CONTAINER_PORT:?error}"
     healthcheck: