新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/mysqld_exporter/defaults/main.yml

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+---
+flag: ~/.flag/{{ role_name }}

prometheus/roles/mysqld_exporter/tasks/main.yml

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+---
+# 校验 Mysqld Exporter 是否安装
+- name: '<{{ cmd | upper }}> | 校验 Mysqld Exporter 是否安装'
+  stat:
+    path: '{{ flag }}'
+  register: ret
+
+# 安装 Mysqld Exporter
+- block: 
+  - name: '<{{ cmd | upper }}> | 创建 Mysqld Exporter 相关目录'
+    file:
+      path: '{{ mysqld_exporter.dir }}'
+      state: directory
+
+  - name: '<{{ cmd | upper }}> | 安装 Mysqld Exporter'
+    template: 
+      src: '{{ item.src }}'
+      dest: '{{ item.dest }}'
+    loop:
+    - src: docker-compose.yml.j2
+      dest: '{{ mysqld_exporter.dir }}/docker-compose.yml'
+
+  - name: '<{{ cmd | upper }}> | 启动 Mysqld Exporter 容器'
+    shell: |
+      . /etc/profile
+      cd {{ mysqld_exporter.dir }}
+      docker-compose down
+      docker-compose up -d
+
+#  - name: '<{{ cmd | upper }}> | 等待 Mysqld Exporter 服务启动'
+#    wait_for:
+#      port: '{{ mysqld_exporter.port }}'
+
+  - name: '<{{ cmd | upper }}> | 创建 Mysqld Exporter 安装标记'
+    shell: |
+      set -ex
+      mkdir -p ~/.flag
+      touch {{ flag }}
+
+  when:
+  - cmd == "install"
+  - not ret.stat.exists
+
+# 卸载 Mysqld Exporter
+- block:
+  - name: '<{{ cmd | upper }}> | 卸载 Mysqld Exporter'
+    shell: |
+      . /etc/profile
+      cd {{ mysqld_exporter.dir }}
+      docker-compose down
+
+  - name: '<{{ cmd | upper }}> | 清除 Mysqld Exporter 相关文件'
+    shell: |
+      rm -rf {{ mysqld_exporter.dir }}
+      rm -rf {{ flag }}
+
+  when:
+  - cmd == "remove"
+  - ret.stat.exists

prometheus/roles/mysqld_exporter/templates/docker-compose.yml.j2

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+version: "3.9"
+
+services:
+  mysqld-exporter:
+    image: {{ mysqld_exporter.image }}
+    container_name: {{ docker.network.name }}-mysqld-exporter
+    hostname: mysqld-exporter
+    restart: always 
+    networks:
+      - {{ docker.network.name }} 
+    {% for node in mysqld_exporter.nodes -%} 
+    {% if node.host == inventory_hostname -%} 
+    ports: 
+      - {{ node.port }}:9104 
+    environment: 
+      - DATA_SOURCE_NAME={{ node.user }}:{{ node.password }}@({{ node.url }})/{{ node.database }} 
+    {% endif %} 
+    {% endfor %} 
+
+networks:
+  {{ docker.network.name }}:
+    external: true
+    name: {{ docker.network.name }}