Docker Build, Tag, and Push an Image

arazzo: 1.0.1
info:
  title: Docker Build, Tag, and Push an Image
  summary: Check registry credentials, build an image from a build context, tag it for a registry, and push it.
  description: >-
    The CI pipeline flow expressed against the Engine API. The workflow validates
    the registry credentials before doing any expensive work, builds an image from
    a tar build context using BuildKit, inspects the result, applies the registry
    tag, and pushes the tagged image. Checking auth first means a bad credential
    fails in seconds rather than after a full build. Every step spells out its
    request inline so the flow can be read and executed without opening the
    underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: imageApi
  url: ../openapi/docker-image-api-openapi.yml
  type: openapi
- name: systemApi
  url: ../openapi/docker-system-api-openapi.yml
  type: openapi
workflows:
- workflowId: build-and-push-image
  summary: Build an image from a context, tag it for a registry, and push it.
  description: >-
    Validates credentials against the registry, builds the image from the
    supplied tar context, tags the built image into the target repository, and
    pushes that tag to the registry.
  inputs:
    type: object
    required:
    - username
    - password
    - serveraddress
    - buildContext
    - localTag
    - repo
    - tag
    - registryAuth
    properties:
      username:
        type: string
        description: Registry username to validate before building.
      password:
        type: string
        description: Registry password or token.
      serveraddress:
        type: string
        description: Registry address (e.g. "https://index.docker.io/v1/").
      buildContext:
        type: string
        description: The build context as a tar archive (identity, gzip, bzip2, or xz).
      localTag:
        type: string
        description: Local name and tag to apply at build time, in "name:tag" form.
      repo:
        type: string
        description: The repository to tag into for the push (e.g. "someuser/someimage").
      tag:
        type: string
        description: The tag name to apply and push (e.g. "latest").
      registryAuth:
        type: string
        description: Base64url-encoded auth configuration used for the push.
      dockerfile:
        type: string
        description: Path to the Dockerfile within the build context.
      buildargs:
        type: string
        description: JSON map of build-time variables, URI component encoded.
      registryConfig:
        type: string
        description: Base64-encoded JSON of multi-registry auth configurations used during the build.
  steps:
  - stepId: checkCredentials
    description: >-
      Validate the registry credentials up front so an authentication problem
      fails the flow in seconds rather than after a full image build.
    operationId: SystemAuth
    requestBody:
      contentType: application/json
      payload:
        username: $inputs.username
        password: $inputs.password
        serveraddress: $inputs.serveraddress
    successCriteria:
    - condition: $statusCode == 200 || $statusCode == 204
    outputs:
      identityToken: $response.body#/IdentityToken
      status: $response.body#/Status
  - stepId: buildImage
    description: >-
      Build the image from the supplied tar context using the BuildKit backend,
      removing intermediate containers and applying the local build tag.
    operationId: ImageBuild
    parameters:
    - name: t
      in: query
      value: $inputs.localTag
    - name: dockerfile
      in: query
      value: $inputs.dockerfile
    - name: buildargs
      in: query
      value: $inputs.buildargs
    - name: version
      in: query
      value: '2'
    - name: rm
      in: query
      value: true
    - name: pull
      in: query
      value: 'true'
    - name: Content-type
      in: header
      value: application/x-tar
    - name: X-Registry-Config
      in: header
      value: $inputs.registryConfig
    requestBody:
      contentType: application/octet-stream
      payload: $inputs.buildContext
    successCriteria:
    - condition: $statusCode == 200
  - stepId: inspectBuiltImage
    description: >-
      Inspect the freshly built image to confirm it landed in the local store and
      to capture its id and digests for the build record.
    operationId: ImageInspect
    parameters:
    - name: name
      in: path
      value: $inputs.localTag
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      imageId: $response.body#/Id
      repoDigests: $response.body#/RepoDigests
      created: $response.body#/Created
  - stepId: tagImage
    description: >-
      Create the registry-qualified tag that references the built image. The push
      endpoint requires the image to already carry a name that points at the
      target registry.
    operationId: ImageTag
    parameters:
    - name: name
      in: path
      value: $inputs.localTag
    - name: repo
      in: query
      value: $inputs.repo
    - name: tag
      in: query
      value: $inputs.tag
    successCriteria:
    - condition: $statusCode == 201
  - stepId: pushImage
    description: >-
      Push the tagged image to the registry using the supplied auth
      configuration.
    operationId: ImagePush
    parameters:
    - name: name
      in: path
      value: $inputs.repo
    - name: tag
      in: query
      value: $inputs.tag
    - name: X-Registry-Auth
      in: header
      value: $inputs.registryAuth
    successCriteria:
    - condition: $statusCode == 200
  outputs:
    imageId: $steps.inspectBuiltImage.outputs.imageId
    repoDigests: $steps.inspectBuiltImage.outputs.repoDigests