Docker tags action

Desciption

This action generates a list of docker tags for a given refspec.

• Tags must be semver formatted, and master/main are tagged as dev. Other refspecs lead to no tags.
• You can specify the image name
• You can specify a list of registries to push to if you're not using docker hub (or want multiples)

The latest tag will refer to the highest semver that has been tagged, including if you push to an older tag.

Inputs

• repository - Image name, if you don't want to use the git repository name
• registries - A comma separated list of registry names to prefix the tag with, defaults to docker hub
• separator - Optional, the separator between tags, defaults to ,
• fullname - Should we include the registry/image in the tags, or just output versions.

Outputs

• tag: A comma separated list of tags to be passed to docker/build-push-action@v2
• version: The semver parsed version of the image, or the SHA if this is not tag

Example

name: docker build
on:
  push:
    branches:
      - master
    tags:
      - v*
jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Generate tags
        id: tags
        uses: greboid/docker-tags-action@v1
      - name: Set up Docker Build
        uses: docker/setup-buildx-action@v1
      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_HUB_USER }}
          password: ${{ secrets.DOCKER_HUB_TOKEN }}
      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          push: true
          tags: ${{ steps.tags.outputs.tags }}