TT#16679 Enable debian-debug repository for Debian/stretch

This provides $pkg-dbgsym package support (additionally to $pkg-dbg that
still may be present in the main archive).

See
https://www.debian.org/releases/stretch/amd64/release-notes/ch-whats-new.en.html#debug-archive

Change-Id: Ic8b8884556c810cddbcb886de9503812fe8ca957

deployment.sh

@@ -1323,6 +1323,7 @@ fi
 # over official Debian
 MIRROR="${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/debian/"
 SEC_MIRROR="${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/debian-security/"
+DBG_MIRROR="${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/debian-debug/"
 
 if [ -z "${GPG_KEY}" ] ; then
   KEYRING='/etc/apt/trusted.gpg.d/sipwise.gpg'
@@ -1353,6 +1354,10 @@ EOF
 echo "deb ${SEC_MIRROR} ${DEBIAN_RELEASE}-security main contrib non-free" >> /etc/debootstrap/etc/apt/sources.list
 echo "deb ${MIRROR} ${DEBIAN_RELEASE}-updates main contrib non-free" >> /etc/debootstrap/etc/apt/sources.list
 
+if [ "$DEBIAN_RELEASE" != "jessie" ] ; then
+  echo "deb ${DBG_MIRROR} ${DEBIAN_RELEASE}-debug main contrib non-free" >> /etc/debootstrap/etc/apt/sources.list
+fi
+
 if [ -n "$PUPPET" ] ; then
   cat >> /etc/debootstrap/etc/apt/sources.list << EOF
 deb ${DEBIAN_REPO_TRANSPORT}://${DEBIAN_REPO_HOST}/puppetlabs/ ${DEBIAN_RELEASE} main PC1 dependencies
@@ -1593,6 +1598,10 @@ deb ${SEC_MIRROR} ${DEBIAN_RELEASE}-security main contrib non-free
 deb ${MIRROR} ${DEBIAN_RELEASE}-updates main contrib non-free
 EOF
 
+  if [ "$DEBIAN_RELEASE" != "jessie" ] ; then
+    echo "deb ${DBG_MIRROR} ${DEBIAN_RELEASE}-debug main contrib non-free" >> "$TARGET/etc/apt/sources.list.d/debian.list"
+  fi
+
   # support testing rc releases without providing an according installer package ahead
   if [ -n "$AUTOBUILD_RELEASE" ] ; then
     echo "Running installer with sources.list for $DEBIAN_RELEASE + autobuild release-$AUTOBUILD_RELEASE"