Playbook that builds and publishes a collection to Ansible Galaxy

deploy.yml

---
- hosts: localhost
  connection: local
  gather_facts: false

  vars:
    # This should be set via the command line at runtime.
    tag: ''

  pre_tasks:
    - name: Ensure the ANSIBLE_GALAXY_TOKEN environment variable is set.
      fail:
        msg: ANSIBLE_GALAXY_TOKEN is not set.
      when: "lookup('env','ANSIBLE_GALAXY_TOKEN') == ''"

    - name: Ensure the ~/.ansible directory exists.
      file:
        path: ~/.ansible
        state: directory

    - name: Write the Galaxy token to ~/.ansible/galaxy_token
      copy:
        content: |
          token: {{ lookup('env','ANSIBLE_GALAXY_TOKEN') }}
        dest: ~/.ansible/galaxy_token

  tasks:
    - name: Template out the galaxy.yml file.
      template:
        src: templates/galaxy.yml.j2
        dest: ../galaxy.yml

    - name: Build the collection.
      command: >
        ansible-galaxy collection build
        chdir=../

    - name: Publish the collection.
      command: >
        ansible-galaxy collection publish ./geerlingguy-php_roles-{{ tag }}.tar.gz
        chdir=../

In my .travis.yml file:

deploy:
  provider: script
  script: ansible-playbook -i 'localhost,' scripts/deploy.yml -e "tag=$TRAVIS_TAG"
  'on':
    tags: true

Also an explanation with more background, in blog post form: Automatically building and publishing Ansible Galaxy Collections