tools: Add UPLOAD_KEY

Signed-off-by: Matt Turner <mattst88@gentoo.org>

tools/catalyst-auto-amd64.conf

@@ -2,6 +2,7 @@
 # self-explanatory.
 
 UPLOAD_USER=amd64
+UPLOAD_KEY=/root/.ssh/id_rsa
 host=$(hostname)
 
 source /etc/catalyst/release/build.env
@@ -67,7 +68,7 @@ update_symlinks() {
 upload() {
 	echo " ** Uploading $@"
 	rsync \
-	-e 'ssh -i /root/.ssh/id_rsa -o UserKnownHostsFile=/dev/null -o VerifyHostKeyDNS=yes -o StrictHostKeyChecking=no' \
+	-e 'ssh -i ${UPLOAD_KEY} -o UserKnownHostsFile=/dev/null -o VerifyHostKeyDNS=yes -o StrictHostKeyChecking=no' \
 	-a \
 	--omit-dir-times \
 	--delay-updates \