add support of an optional low_mem config profile for mysql

docker/my-dojo/conf/docker-mysql.conf.tpl

@@ -16,3 +16,9 @@ MYSQL_USER=samourai
 # Warning: This option must not be modified after the first installation
 # Type: alphanumeric
 MYSQL_PASSWORD=password
+
+# MySQL configuration profile
+#   default = default configuration parameters
+#   low_mem = configuration minimizing the RAM consumed by the database
+# Values: default | low_mem
+MYSQL_CONF_PROFILE=default

docker/my-dojo/install/install-scripts.sh

@@ -6,6 +6,12 @@ else
   source ./conf/docker-bitcoind.conf.tpl
 fi
 
+if [ -f ./conf/docker-mysql.conf ]; then
+  source ./conf/docker-mysql.conf
+else
+  source ./conf/docker-mysql.conf.tpl
+fi
+
 if [ -f ./conf/docker-explorer.conf ]; then
   source ./conf/docker-explorer.conf
 else
@@ -111,4 +117,12 @@ init_config_files() {
     cp ../../static/admin/conf/index-mainnet.js ../../static/admin/conf/index.js
     echo "Initialized index.js (admin module)"
   fi
+
+  # Initialize config files for mysql
+  if [ "$MYSQL_CONF_PROFILE" == "low_mem" ]; then
+    cp ./mysql/mysql-low_mem.cnf ./mysql/mysql-dojo.cnf
+  else
+    cp ./mysql/mysql-default.cnf ./mysql/mysql-dojo.cnf
+  fi
+  echo "Initialized mysql-dojo.cnf (mysql)"
 }

docker/my-dojo/install/upgrade-scripts.sh

@@ -6,6 +6,12 @@ else
   source ./conf/docker-common.conf.tpl
 fi
 
+if [ -f ./conf/docker-mysql.conf ]; then
+  source ./conf/docker-mysql.conf
+else
+  source ./conf/docker-mysql.conf.tpl
+fi
+
 if [ -f ./conf/docker-explorer.conf ]; then
   source ./conf/docker-explorer.conf
 else
@@ -95,6 +101,14 @@ update_config_files() {
     cp ../../static/admin/conf/index-mainnet.js ../../static/admin/conf/index.js
     echo "Initialized index.js (admin module)"
   fi
+
+  # Initialize config files for mysql
+  if [ "$MYSQL_CONF_PROFILE" == "low_mem" ]; then
+    cp ./mysql/mysql-low_mem.cnf ./mysql/mysql-dojo.cnf
+  else
+    cp ./mysql/mysql-default.cnf ./mysql/mysql-dojo.cnf
+  fi
+  echo "Initialized mysql-dojo.cnf (mysql)"
 }
 
 # Update a configuration file from template

docker/my-dojo/mysql/mysql-low_mem.cnf

@@ -0,0 +1,10 @@
+[mysqld]
+sql_mode="NO_ENGINE_SUBSTITUTION"
+performance_schema=off
+innodb_buffer_pool_size=128M
+innodb_buffer_pool_chunk_size=16M
+key_buffer_size=8M
+tmp_table_size=1M
+max_connections=20
+sort_buffer_size=1M
+query_cache_size=8M