setup-apt-repo: Add pgroonga code for Debian stretch.

The Groonga apt repository for Debian has a slightly different
structure.

scripts/lib/setup-apt-repo

@@ -19,6 +19,13 @@ deb http://ppa.launchpad.net/tabbott/zulip/ubuntu $release main
 deb-src http://ppa.launchpad.net/groonga/ppa/ubuntu $release main
 deb-src http://ppa.launchpad.net/tabbott/zulip/ubuntu $release main
 EOF
+elif [ "$release" = "stretch" ]; then
+    apt-get install -y -V apt-transport-https
+    apt-key add "$SCRIPTS_PATH"/setup/pgroonga-debian.asc
+    cat >/etc/apt/sources.list.d/zulip.list <<EOF
+deb https://packages.groonga.org/debian/ stretch main
+deb-src https://packages.groonga.org/debian/ stretch main
+EOF
 else
     echo "Unsupported release $release."
     exit 1

scripts/setup/pgroonga-debian.asc

@@ -0,0 +1,30 @@
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