push-to-registry/README.md

# push-to-registry

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Push-to-registry is a GitHub Action for pushing a container image to an image registry, such as Dockerhub, quay&#46;io, the GitHub Container Registry, or an OpenShift integrated registry.

This action only runs on Linux, as it uses [podman](https://github.com/containers/Podman) to perform the push. [GitHub's Ubuntu action runners](https://github.com/actions/virtual-environments#available-environments) come with Podman preinstalled. If you are not using those runners, you must first [install Podman](https://podman.io/getting-started/installation).

You can log in to your container registry for the entire job using the [**podman-login**](https://github.com/redhat-actions/podman-login) action. Otherwise, use the `username` and `password` inputs to log in for this step.

## Action Inputs

Refer to the [`podman push`](http://docs.podman.io/en/latest/markdown/podman-manifest-push.1.html) documentation for more information.

| Input Name | Description | Default |
| ---------- | ----------- | ------- |
| image	| Name of the image you want to push. | **Required**
| tags | The tag or tags of the image to push. For multiple tags, separate by a space. For example, `latest ${{ github.sha }}`. | `latest`
| registry | URL of the registry to push the image to. Eg. `quay.io/<username>` | **Required**
| username | Username with which to authenticate to the registry. Required unless already logged in to the registry. | None
| password | Password, encrypted password, or access token to use to log in to the registry. Required unless already logged in to the registry. | None
| tls-verify | Verify TLS certificates when contacting the registry. Set to `false` to skip certificate verification. | `true`
| digestfile | After copying the image, write the digest of the resulting image to the file. The contents of this file are the digest output. | Auto-generated from image and tag
| extra-args | Extra args to be passed to podman push. Separate arguments by newline. Do not use quotes. | None

## Action Outputs

`digest`: The pushed image digest, as written to the `digestfile`.<br>
For example:
```
sha256:66ce924069ec4181725d15aa27f34afbaf082f434f448dc07a42daa3305cdab3
```

For multiple tags, the digest is the same.

`registry-paths`: A JSON array of registry paths to which the tag(s) were pushed.<br>

For example:

```
[ "quay.io/username/spring-image:v1", "quay.io/username/spring-image:latest" ]
```

`registry-path`: The first element of `registry-paths`, as a string.

## Examples

The example below shows how the `push-to-registry` action can be used to push an image created by the [**buildah-build**](https://github.com/redhat-actions/buildah-build) action.

```yaml
name: Build and Push Image
on: [ push ]

jobs:
  build:
    name: Build and push image
    runs-on: ubuntu-20.04

    steps:
    - uses: actions/checkout@v2

    - name: Build Image
      id: build-image
      uses: redhat-actions/buildah-build@v2
      with:
        image: my-app
        tags: latest ${{ github.sha }}
        dockerfiles: |
          ./Dockerfile

    # Podman Login action (https://github.com/redhat-actions/podman-login) also be used to log in,
    # in which case 'username' and 'password' can be omitted.
    - name: Push To quay.io
      id: push-to-quay
      uses: redhat-actions/push-to-registry@v2
      with:
        image: ${{ steps.build-image.outputs.image }}
        tags: ${{ steps.build-image.outputs.tags }}
        registry: quay.io/quay-user
        username: quay-user
        password: ${{ secrets.REGISTRY_PASSWORD }}

    - name: Print image url
      run: echo "Image pushed to ${{ steps.push-to-quay.outputs.registry-paths }}"
```

## Note about images built with Docker

This action uses `Podman` to push, but can also push images built with `Docker`. However, Docker and Podman store their images in different locations, and Podman can only push images in its own storage.

If the image to push is present in the Docker image storage but not in the Podman image storage, it will be pulled into Podman's storage.

If the image to push is present in both the Docker and Podman image storage, the action will push the image which was more recently built, and log a warning.

If the action pulled an image from the Docker image storage into the Podman storage, it will be cleaned up from the Podman storage before the action exits.

## Note about GitHub runners and Podman
We recommend using `runs-on: ubuntu-20.04` since it has a newer version of Podman.

If you are on `ubuntu-18.04` (which is currently aliased to [`ubuntu-latest`](https://github.com/actions/virtual-environments/issues/1816)) your workflow will use an older version of Podman and may encounter issues such as [#26](https://github.com/redhat-actions/push-to-registry/issues/26).

## Troubleshooting
Note that quay.io repositories are private by default.<br>

This means that if you push an image for the first time, you will have to authenticate before pulling it, or go to the repository's settings and change its visibility.