Add proxysql

proxysql

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+version: "3.8"
+
+services:
+  proxysql:
+    image: proxysql/proxysql:2.5.5
+    container_name: proxysql
+    restart: unless-stopped
+
+    ports:
+      - "6032:6032"
+      - "6033:6033"
+
+    command:
+      - /bin/sh
+      - -c
+      - |
+        set -e
+
+        proxysql -f &
+        PID=$!
+
+        for i in $(seq 1 30); do
+          mysql -uadmin -padmin -h127.0.0.1 -P6032 -e "SELECT 1" >/dev/null 2>&1 && break
+          sleep 1
+        done
+
+        mysql -uadmin -padmin -h127.0.0.1 -P6032 <<SQL
+        SET mysql-enable_cleartext_auth=1;
+        LOAD MYSQL VARIABLES TO RUNTIME;
+        SAVE MYSQL VARIABLES TO DISK;
+
+        DELETE FROM mysql_servers;
+        INSERT INTO mysql_servers (hostgroup_id, hostname, port) VALUES
+          (10,'192.168.19.90',3306),
+          (10,'192.168.19.91',3306),
+          (10,'192.168.19.92',3306);
+        LOAD MYSQL SERVERS TO RUNTIME;
+        SAVE MYSQL SERVERS TO DISK;
+
+        DELETE FROM mysql_users;
+        INSERT INTO mysql_users (
+          username,password,default_hostgroup,
+          active,frontend,backend
+        ) VALUES (
+          'testuser','testpass123',10,1,1,1
+        );
+        LOAD MYSQL USERS TO RUNTIME;
+        SAVE MYSQL USERS TO DISK;
+        SQL
+
+        wait $PID