fix: populate ldns submodule and add autotools to LDNS build stage

- Re-cloned zonemaster-ldns with --recurse-submodules so the bundled
  ldns C library source (including Changelog and configure.ac) is present
- Added autoconf, automake, libtool to Dockerfile.backend ldns-build stage
  so libtoolize + autoreconf can generate ldns/configure during make

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

zonemaster-ldns/ldns/test/testbed/testbed.sh

@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+# Testbed for projects
+# By Wouter Wijngaards, NLnet Labs, 2006.
+# BSD License.
+
+# this version prefers gmake if available.
+# adds variable LDNS for the LDNS path to use.
+
+REPOSITORY=svn+ssh://open.nlnetlabs.nl/svn/libdns/trunk
+DIR=ldns_ttt
+
+# global settings
+CONFIGURE_FLAGS=""
+PWD=`pwd`
+REPORT_FILE="$PWD/testdata/testbed.report"
+LOG_FILE=testdata/testbed.log
+HOST_FILE=testdata/host_file.$USER
+
+if test ! -f $HOST_FILE; then
+	echo "No such file: $HOST_FILE"
+	exit 1
+fi
+
+function echossh() # like ssh but echos.
+{
+	echo "ssh $*"
+	ssh $*
+}
+
+# Compile and run NSD on platforms
+function dotest() 
+# parameters: <host> <dir>
+# host is name of ssh host
+# dir is directory of nsd trunk on host
+{
+	echo "$1 begin on "`date` | /usr/bin/tee -a $REPORT_FILE
+
+	if test $SVN; then
+		echossh $1 "cd $2; $SVN up"
+	else
+		# tar and copy this dir
+		echo on
+		cd ..
+		tar -cf ldns_test.tar .
+		scp ldns_test.tar $1:$2
+		echossh $1 "cd $2; tar xf ldns_test.tar"
+		rm -f ldns_test.tar
+	fi
+	if test $RUN_TEST = yes; then
+	echossh $1 "cd $2/test; $TPKG clean"
+	echossh $1 "cd $2/test; bash test_all.sh $TPKG"
+	echossh $1 "cd $2/test; $TPKG -q report" | /usr/bin/tee -a $REPORT_FILE
+	fi
+	echo "$1 end on "`date` | /usr/bin/tee -a $REPORT_FILE
+}
+
+echo "on "`date`" by $USER." > $REPORT_FILE
+echo "on "`date`" by $USER." > $LOG_FILE
+
+# read host names
+declare -a hostname desc dir reconf make libtoolize vars
+IFS='	'
+i=0
+while read a b c d e; do
+	if echo $a | grep "^#" >/dev/null; then
+		continue # skip it
+	fi
+	# append after arrays
+	hostname[$i]=$a
+	desc[$i]=$b
+	dir[$i]=$c
+	tpkg[$i]=$d
+	svn[$i]=$e
+
+	i=$(($i+1))
+done <$HOST_FILE
+echo "testing on $i hosts"
+
+# do the test
+for((i=0; i<${#hostname[*]}; i=$i+1)); do
+	if echo ${hostname[$i]} | grep "^#" >/dev/null; then
+		continue # skip it
+	fi
+	 echo "hostname=[${hostname[$i]}]"
+	 echo "desc=[${desc[$i]}]"
+	 echo "dir=[${dir[$i]}]"
+	 echo "tpkg=[${tpkg[$i]}]"
+	 echo "svn=[${svn[$i]}]"
+ 
+	RUN_TEST="yes"
+	TPKG="${tpkg[$i]}"
+	SVN="${svn[$i]}"
+	#eval ${vars[$i]}
+	echo "*** ${hostname[$i]} ${desc[$i]} ***" | /usr/bin/tee -a $LOG_FILE | /usr/bin/tee -a $REPORT_FILE
+	dotest ${hostname[$i]} ${dir[$i]} 2>&1 | /usr/bin/tee -a $LOG_FILE
+done
+
+echo "done"