add more details to comment about digests

Author: strtgbb

tests/integration/runner

@@ -430,9 +430,11 @@ if __name__ == "__main__":
             else:
                 logging.info("Unknown image %s", image)
 
-    # Get the correct image tags for the current branch.
-    # If the files an image depends on have been changed,
-    # the tag will not exist until CI job has been run.
+    # Get the image tags that CICD generates for the current branch.
+    # These tags will be used to populate unspecified arguments (--docker-image-version, --docker-compose-images-tags)
+    # If the files an image depends on have been changed, the tag will not exist until CI job has been run.
+    # These files change rarely, so it is usually safe to assume the tags exist.
+
     docker_digester = DockerDigester()
     imagename_digest_dict = (
         docker_digester.get_all_digests()