Fix checksum parsing for Cirros and Rocky Linux

For Rocky Linux, the checksum file format differs from Ubuntu.  The
current awk expression failed to extract the correct checksum and would
instead output SHA256. This caused checksum validation to fail. A
similar issue exists for CirrOS which uses the MD5 algorithm.

Changes the logic to first extract the line with the corresponding
image name and then searches for a string that looks like a checksum
within that line.

Closes-Bug: #2081031
Change-Id: Id426db0ad418898a2ebe9f2b5001945520dc6b1d

Author: jovial

playbooks/roles/bifrost-ironic-install/tasks/download_deployment_image.yml

@@ -27,7 +27,11 @@
         mode: "0644"
 
 - name: "Extract deployment image checksum"
-  command: awk '/{{ deploy_image_upstream_url | basename }}|^[a-z0-9]+$/{print $1}' {{ http_boot_folder }}/{{ deploy_image_filename }}-checksum.CHECKSUMS
+  shell:
+    cmd: |
+      set -o pipefail
+      grep "{{ deploy_image_upstream_url | basename }}" {{ http_boot_folder }}/{{ deploy_image_filename }}-checksum.CHECKSUMS | grep -owE "[[:xdigit:]]{32,64}"
+    executable: /bin/bash
   register: parsed_deployment_image_checksum
   failed_when: parsed_deployment_image_checksum is failed
                or not parsed_deployment_image_checksum.stdout

releasenotes/notes/fixes-checksum-parsing-82c04ff1bb575c51.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes an issue with checksum verification when setting
+    ``upstream_deploy_image_distribution`` to ``rocky`` or
+    ``cirros``.