add postgres exporter

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/postgres_exporter/tasks/install.yml

@@ -0,0 +1,29 @@
+---
+- name: Download/Extract "{{ download_url }}"
+  ansible.builtin.unarchive:
+    src: "{{ download_url }}"
+    dest: /tmp/
+    remote_src: true
+    mode: "755"
+
+- name: "Move binary into path: {{ bin_path }}"
+  ansible.builtin.copy:
+    src: "/tmp/{{ bin_name }}-{{ tag }}.linux-{{ go_arch }}/{{ bin_name }}"
+    dest: "{{ bin_path }}"
+    mode: "755"
+    remote_src: true
+  become: true
+
+- name: "Create user: {{ bin_name }}"
+  ansible.builtin.user:
+    name: "{{ bin_name }}"
+    shell: /sbin/nologin
+    state: present
+  become: true
+
+- name: Copy the node_exporter systemd unit file.
+  ansible.builtin.template:
+    src: "{{ bin_name }}.service.j2"
+    dest: "/etc/systemd/system/{{ bin_name }}.service"
+    mode: "644"
+  become: true