Automatically setting the release tag on a GitHub workflow - github

Question

I am trying to build an action that is triggered on creating a new release on GitHub which works fine, but I would like to reference the tag in my action:
name: Build production container
on:
release:
types:
- created
jobs:
deploy:
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout#v2
- name: Build the Docker image
run: |
echo "${{ SECRET }}" | docker login -u ME --password-stdin docker.pkg.github.com
docker build app/ -t docker.pkg.github.com/REPO_PATH/image:$VERSION
docker push docker.pkg.github.com/REPO_PATH/image:$VERSION
shell: bash
env:
VERSION: 0.0.1
This is my working action, but I would like to automatically pull the tag into the VERSION environment variable. I read the documentation, especially here where the GitHub context is referenced, but I can't seem to find anything about it.

Answer 1

It took me a while to figure out that the action has a different context for each method documented here. So the parameter I was looking for is the and I've set my action up after this example:
name: Build production container
on:
release:
types:
- created
jobs:
deploy:
runs-on: ubuntu-latest
steps:
- name: Checkout
uses: actions/checkout#v2
- name: Get Tag Name
id: tag_name
run: |
echo ::set-output name=SOURCE_TAG::${GITHUB_REF#refs/tags/}
- name: Build the Docker image
run: |
echo "${{ SECRET }}" | docker login -u ME --password-stdin docker.pkg.github.com
docker build app/ -t docker.pkg.github.com/REPO_PATH/image:$VERSION
docker push docker.pkg.github.com/REPO_PATH/image:$VERSION
shell: bash
env:
VERSION: ${{ steps.tag_name.outputs.SOURCE_TAG }}
This basically adds getting the source parameter as an extra step, this way I can use it in the environment variables of the next step.