build: remove git mailmap usage

The support of :mailmap flag in git-for-each-ref starts from git 2.43.0,
our dev cluster repository apt 2.4.13 (amd64) has git upto 2.34.1, thus
breaking our release script.

Using git log options instead to extract tag information with mailmap
applied. This will help users having same view in git commit messages
and debian changelogs.

Signed-off-by: Ye Xiang <[email protected]>

Author: yexiang-aws

contrib/scripts/generate_debian_changelog.sh

@@ -1,15 +1,5 @@
 #!/bin/bash
 
-fmt=" \
-tagname=%(refname:short) \
-tagger_name=%(taggername:mailmap) \
-tagger_email=%(taggeremail:mailmap) \
-tagger_when=%(taggerdate) \
-committer_name=%(committername:mailmap) \
-committer_email=%(committeremail:mailmap) \
-committer_when=%(committerdate) \
-"
-
 if [ $# -eq 0 ]; then
 	tag=HEAD
 else
@@ -22,7 +12,8 @@ if [ $? -ne 0 ]; then
 	exit 0
 fi
 
-git for-each-ref --shell --sort=-v:refname --format "$fmt" --merged "$tag" | {
+git log --use-mailmap --no-walk --format="tagname='%D' tagger_name='%aN' tagger_email='<%aE>' tagger_when='%ad' committer_name='%cN' committer_email='<%cE>' committer_when='%cd'" \
+    --date="format:%a %b %-d %T %Y %z" $(git tag --merged "$tag") | sed "s/tagname='tag: \([^,']*\)'/tagname='\1'/" | {
 	while read line; do
 		eval $line
 		(echo ${tagname} | grep -qE '^v[0-9]') || continue