Compress raw/vhd images

This uses zstd to compress raw and vhd images before uploading to
temporary storage.  The executor will detect the .zst extension and
decompress them before uploading to the cloud.

Depends-On: https://review.opendev.org/935956
Change-Id: I76303cbb3f1bbaf99ba7852bf1853dcc28b6d9b3

playbooks/opendev-build-diskimage-base/post-inner.yaml

@@ -0,0 +1,27 @@
+- name: Compress image
+  when: "upload_image_format in ['raw', 'vhd']"
+  command: zstd '{{ build_diskimage_image_root }}/{{ build_diskimage_image_name }}.{{ upload_image_format }}'
+- name: Set extension
+  when: "upload_image_format in ['raw', 'vhd']"
+  set_fact:
+    upload_image_extension: '{{ upload_image_format }}.zst'
+- name: Set extension
+  when: "upload_image_format not in ['raw', 'vhd']"
+  set_fact:
+    upload_image_extension: '{{ upload_image_format }}'
+- name: Upload image
+  no_log: true
+  include_role:
+    name: image-upload-swift
+  vars:
+    cloud:
+      auth_type: 'v3applicationcredential'
+      auth:
+        auth_url: 'https://keystone.api.sjc3.rackspacecloud.com/v3'
+        application_credential_id: '{{ image_upload_secret.application_credential_id }}'
+        application_credential_secret: '{{ image_upload_secret.application_credential_secret }}'
+        user_domain_name: rackspace_cloud_domain
+    container: images-1f49951f5beb
+    filename: '{{ build_diskimage_image_root }}/{{ build_diskimage_image_name }}.{{ upload_image_extension }}'
+    name: '{{ zuul.build }}-{{ build_diskimage_image_name }}.{{ upload_image_extension }}'
+    delete_after: 259200

playbooks/opendev-build-diskimage-base/post.yaml

@@ -1,22 +1,8 @@
 - hosts: all
   tasks:
     - name: Upload image
-      no_log: true
       when: image_upload_secret is defined and zuul_success
       with_items: '{{ build_diskimage_formats }}'
       loop_control:
         loop_var: upload_image_format
-      include_role:
-        name: image-upload-swift
-      vars:
-        cloud:
-          auth_type: 'v3applicationcredential'
-          auth:
-            auth_url: 'https://keystone.api.sjc3.rackspacecloud.com/v3'
-            application_credential_id: '{{ image_upload_secret.application_credential_id }}'
-            application_credential_secret: '{{ image_upload_secret.application_credential_secret }}'
-            user_domain_name: rackspace_cloud_domain
-        container: images-1f49951f5beb
-        filename: '{{ build_diskimage_image_root }}/{{ build_diskimage_image_name }}.{{ upload_image_format }}'
-        name: '{{ zuul.build }}-{{ build_diskimage_image_name }}.{{ upload_image_format }}'
-        delete_after: 259200
+      include_tasks: post-inner.yaml

playbooks/opendev-build-diskimage-base/pre.yaml

@@ -9,6 +9,7 @@
           # The following are required for the image upload
           - python3-openstacksdk
           - python3-oslo.utils
+          - zstd
     - name: Setup dib directories
       become: true
       shell: |