cloudapi: add support for uploading to a container registry

Worker
------
Add configuration for the default container registry.
Use the default container registry if not provided as part
of the image name.
When using the default registry use the configured values
Return the image url as part of the result.

Composer Worker API
-------------------
Add `ContainerTargetResultOptions` to return the image url

Composer API
------------
Add UploadOptions to allow setting of the image name and tag
Add UploadStatus to return the url of the uploaded image

Co-Developed-By: Christian Kellner <christian@kellner.me>

internal/cloudapi/v2/openapi.v2.yml

@@ -511,6 +511,7 @@ components:
             - $ref: '#/components/schemas/AWSS3UploadStatus'
             - $ref: '#/components/schemas/GCPUploadStatus'
             - $ref: '#/components/schemas/AzureUploadStatus'
+            - $ref: '#/components/schemas/ContainerUploadStatus'
     UploadStatusValue:
       type: string
       enum: ['success', 'failure', 'pending', 'running']
@@ -521,6 +522,7 @@ components:
         - aws.s3
         - gcp
         - azure
+        - container
     AWSEC2UploadStatus:
       type: object
       required:
@@ -566,7 +568,22 @@ components:
         build_id:
           type: integer
           example: 42
-
+    ContainerUploadStatus:
+      type: object
+      additionalProperties: false
+      required:
+        - url
+        - digest
+      properties:
+        url:
+          type: string
+          example: 'quay.io/myaccount/osbuild:latest'
+          description: |
+            FQDN of the uploaded image
+        digest:
+          type: string
+          description: |
+            Digest of the manifest of the uploaded container on the registry
     ComposeMetadata:
       allOf:
       - $ref: '#/components/schemas/ObjectReference'
@@ -700,6 +717,7 @@ components:
       - $ref: '#/components/schemas/AWSS3UploadOptions'
       - $ref: '#/components/schemas/GCPUploadOptions'
       - $ref: '#/components/schemas/AzureUploadOptions'
+      - $ref: '#/components/schemas/ContainerUploadOptions'
       description: |
         This should really be oneOf but AWSS3UploadOptions is a subset of
         AWSEC2UploadOptions. This means that all AWSEC2UploadOptions objects
@@ -824,6 +842,23 @@ components:
             Name of the uploaded image. It must be unique in the given resource group.
             If name is omitted from the request, a random one based on a UUID is
             generated.
+    ContainerUploadOptions:
+      type: object
+      additionalProperties: false
+      required:
+        - name
+        - tag
+      properties:
+        name:
+          type: string
+          example: 'osbuild'
+          description: |
+            Name for the created container image
+        tag:
+          type: string
+          example: 'latest'
+          description: |
+            Tag for the created container image
     Customizations:
       type: object
       properties: