add fluent plugin for mysql status

docker/fluentd/Dockerfile

@@ -1,12 +1,14 @@
 FROM ubuntu:18.10
 
 RUN apt update && apt upgrade -y && \
-    apt install build-essential ruby ruby-dev -y && \
+    apt install build-essential ruby ruby-dev -y libmariadb-dev libmariadb3 git zlib1g-dev libssl-dev && \
     apt-get clean
 
 RUN gem install fluentd --no-ri --no-rdoc
 RUN gem install fluent-plugin-cloudwatch-logs
 RUN gem install fluent-plugin-ufw
+RUN git clone https://github.com/markuman/fluent-plugin-mysql-status; cd fluent-plugin-mysql-status; gem build fluent-plugin-mysql-status.gemspec; gem install *.gem
+
 RUN fluentd --setup ./fluent
 
 CMD fluentd -c ./fluent/fluent.conf