all: replace beku_test in testdata with gitsubmodule

Previously, the beku_test is bare clone of git repository stored as is.
This cause an initial clone of the beku repository itself does not
recognize it as git repository, which make the test fail:

  go test -v -coverprofile=cover.out ./... || rm -f cover.out
  fatal: '/home/ms/go/src/git.sr.ht/~shulhan/beku/testdata/beku_test.git' does not appear to be a git repository
  fatal: Could not read from remote repository.

  Please make sure you have the correct access rights
  and the repository exists.
  2022/01/30 10:56:19 gitInstall: Clone: exit status 128
  FAIL    github.com/shuLhan/beku 0.008s

This changes make the testdata/beku_test.git as git submodule, to make
the test run well.

1 files changed, 0 insertions, 42 deletions

diff --git a/testdata/beku_test.git/hooks/prepare-commit-msg.sample b/testdata/beku_test.git/hooks/prepare-commit-msg.sample
deleted file mode 100755
index 10fa14c..0000000
--- a/testdata/beku_test.git/hooks/prepare-commit-msg.sample
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/bin/sh
-#
-# An example hook script to prepare the commit log message.
-# Called by "git commit" with the name of the file that has the
-# commit message, followed by the description of the commit
-# message's source.  The hook's purpose is to edit the commit
-# message file.  If the hook fails with a non-zero status,
-# the commit is aborted.
-#
-# To enable this hook, rename this file to "prepare-commit-msg".
-
-# This hook includes three examples. The first one removes the
-# "# Please enter the commit message..." help message.
-#
-# The second includes the output of "git diff --name-status -r"
-# into the message, just before the "git status" output.  It is
-# commented because it doesn't cope with --amend or with squashed
-# commits.
-#
-# The third example adds a Signed-off-by line to the message, that can
-# still be edited.  This is rarely a good idea.
-
-COMMIT_MSG_FILE=$1
-COMMIT_SOURCE=$2
-SHA1=$3
-
-/usr/bin/perl -i.bak -ne 'print unless(m/^. Please enter the commit message/..m/^#$/)' "$COMMIT_MSG_FILE"
-
-# case "$COMMIT_SOURCE,$SHA1" in
-#  ,|template,)
-#    /usr/bin/perl -i.bak -pe '
-#       print "\n" . `git diff --cached --name-status -r`
-# 	 if /^#/ && $first++ == 0' "$COMMIT_MSG_FILE" ;;
-#  *) ;;
-# esac
-
-# SOB=$(git var GIT_COMMITTER_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
-# git interpret-trailers --in-place --trailer "$SOB" "$COMMIT_MSG_FILE"
-# if test -z "$COMMIT_SOURCE"
-# then
-#   /usr/bin/perl -i.bak -pe 'print "\n" if !$first_line++' "$COMMIT_MSG_FILE"
-# fi