Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/scripts/replica-mysql-config.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+until docker exec mattermost-mysql sh -c 'mysql -u root -pmostest -e ";"'
+do
+    echo "Waiting for mattermost-mysql database connection..."
+    sleep 4
+done
+
+priv_stmt='GRANT REPLICATION SLAVE ON *.* TO "mmuser"@"%" IDENTIFIED BY "mostest"; FLUSH PRIVILEGES;'
+docker exec mattermost-mysql sh -c "mysql -u root -pmostest -e '$priv_stmt'"
+
+until docker-compose -f docker-compose.makefile.yml exec mysql-read-replica sh -c 'mysql -u root -pmostest -e ";"'
+do
+    echo "Waiting for mysql-read-replica database connection..."
+    sleep 4
+done
+
+docker-ip() {
+    docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$@"
+}
+
+MS_STATUS=`docker exec mattermost-mysql sh -c 'mysql -u root -pmostest -e "SHOW MASTER STATUS"'`
+CURRENT_LOG=`echo $MS_STATUS | awk '{print $6}'`
+CURRENT_POS=`echo $MS_STATUS | awk '{print $7}'`
+
+start_slave_stmt="CHANGE MASTER TO MASTER_HOST='$(docker-ip mattermost-mysql)',MASTER_USER='mmuser',MASTER_PASSWORD='mostest',MASTER_LOG_FILE='$CURRENT_LOG',MASTER_LOG_POS=$CURRENT_POS; START SLAVE;"
+start_slave_cmd='mysql -u root -pmostest -e "'
+start_slave_cmd+="$start_slave_stmt"
+start_slave_cmd+='"'
+docker exec mattermost-mysql-read-replica sh -c "$start_slave_cmd"
+
+docker exec mattermost-mysql-read-replica sh -c "mysql -u root -pmostest -e 'SHOW SLAVE STATUS \G'"