Broke apart the playbook into roles.

iot/roles/mosquitto/defaults/main.yaml

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+---
+# Default variables for Mosquitto role
+mosquitto_user: "{{ ansible_user }}"
+mosquitto_image: "mosquitto:latest"
+mosquitto_directory: "/opt/mosquitto"
+mosquitto_container: "mosquitto"

iot/roles/mosquitto/tasks/main.yaml

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+---
+# Tasks for Mosquitto role
+- getent:
+    database: passwd
+    key: "{{ mosquitto_user }}"
+    split: ":"
+
+- name: Pull Mosquitto image
+  docker_image:
+    name: "{{ mosquitto_image }}"
+    source: pull
+    force_source: yes
+
+- name: Ensure Mosquitto Directory exists
+  file:
+      path: "{{ mosquitto_directory }}"
+      state: directory
+      group: 0 # "{{ mosquitto_user }}"
+      owner: 0 # "{{ mosquitto_user }}"
+      mode: 0755
+
+- name: Ensure Mosquitto Config Directory exists
+  file:
+      path: "{{ mosquitto_directory }}/config"
+      state: directory
+      group: 0 # "{{ mosquitto_user }}"
+      owner: 0 # "{{ mosquitto_user }}"
+      mode: 0755
+
+- name: Copy the Mosquitto conf file
+  template:
+    src: "files/mosquitto.conf"
+    dest: "{{ mosquitto_directory }}/config/mosquitto.conf"
+    group: 1883 # "{{ mosquitto_user }}"
+    owner: 1883 # "{{ mosquitto_user }}"
+    mode: 0646
+
+# - name: Check if Mosquitto passwd file exists
+#   stat: path="{{ mosquitto_directory }}/config/passwd"
+#   register: status
+
+- name: Ensure Mosquitto passwd file exists
+  template:
+      src: "files/passwd"
+      dest: "{{ mosquitto_directory }}/config/passwd"
+      group: 1883 # "{{ mosquitto_user }}"
+      owner: 1883 # "{{ mosquitto_user }}"
+      mode: 0646
+
+- name: Encrypt the docker file
+  command: docker exec -i mosquitto mosquitto_passwd -U /mosquitto/config/passwd
+
+- name: Ensure Mosquitto Log Directory exists
+  file:
+      path: "{{ mosquitto_directory }}/log"
+      state: directory
+      group: 0 # "{{ mosquitto_user }}"
+      owner: 0 # "{{ mosquitto_user }}"
+      mode: 0755
+
+- name: Ensure Mosquitto log file exists
+  file:
+      path: "{{ mosquitto_directory }}/log/mosquitto.log"
+      state: touch
+      group: 0 # "{{ mosquitto_user }}"
+      owner: 0 # "{{ mosquitto_user }}"
+      mode: 0646
+
+- name: Create Mosquitto container
+  docker_container:
+    name: "{{ mosquitto_container }}"
+    image: "{{ mosquitto_image }}"
+    state: started
+    restart_policy: "unless-stopped"
+    # user: 0:0 # "{{ getent_passwd[mosquitto_user][1] }}:{{ getent_passwd[mosquitto_user][2] }}"
+    published_ports:
+      - 127.0.0.1:9001:9001
+      - 1883:1883
+    volumes:
+      - "{{ mosquitto_directory }}/config:/mosquitto/config"
+      - "{{ mosquitto_directory }}/data:/mosquitto/data"
+      - "{{ mosquitto_directory }}/log:/mosquitto/log"