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# https://docs.github.com/en/actions/use-cases-and-examples/publishing-packages/publishing-docker-images
name: Build and Publish Image
# Configures this workflow to run every time a change is pushed to the branch called `release`.
on:
push:
branches: ['release']
# Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
env:
REGISTRY: ghcr.io
IMAGE_NAME: bccdc-phl/auspice
jobs:
build-and-publish-image:
runs-on: ubuntu-latest
# Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
permissions:
contents: read
packages: write
attestations: write
id-token: write
steps:
- name: Checkout repository
uses: actions/checkout@v4
# Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that
# will publish the packages. Once published, the packages are scoped to the account defined here.
- name: Log in to the Container registry
uses: docker/login-action@v3
with:
registry: ${{ env.REGISTRY }}
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}
# This step uses [docker/metadata-action](https://github.com/docker/metadata-action#about) to extract tags and labels
# that will be applied to the specified image. The `id` "meta" allows the output of this step to be referenced in
# a subsequent step. The `images` value provides the base name for the tags and labels.
- name: Extract metadata (tags, labels) for Docker
id: meta
uses: docker/metadata-action@v5
with:
images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
# This step uses the `docker/build-push-action` action to build the image, based on your repository's `Dockerfile`. If the build succeeds, it pushes the image to GitHub Packages.
# It uses the `context` parameter to define the build's context as the set of files located in the specified path. For more information,
# see "[Usage](https://github.com/docker/build-push-action#usage)" in the README of the `docker/build-push-action` repository.
# It uses the `tags` and `labels` parameters to tag and label the image with the output from the "meta" step.
- name: Build and push Docker image
id: push
uses: docker/build-push-action@v6
with:
context: .
push: true
tags: ${{ steps.meta.outputs.tags }}
labels: ${{ steps.meta.outputs.labels }}
# This step generates an artifact attestation for the image, which is an unforgeable statement about where and how it was built.
# It increases supply chain security for people who consume the image. For more information,
# see "[Using artifact attestations to establish provenance for builds](https://docs.github.com/en/actions/security-guides/using-artifact-attestations-to-establish-provenance-for-builds)."
- name: Generate artifact attestation
uses: actions/attest-build-provenance@v1
with:
subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
subject-digest: ${{ steps.push.outputs.digest }}
push-to-registry: true