meta-google: gbmc-dev-ssh-key: Add package

We want a key we can freely distribute to anyone who is building gBMC
for use with SSH on development images.

Change-Id: Iafedbbc6ebe2e62bce966bb368dd53831e29bd00
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
index 042bb08..0c74fc8 100644
--- a/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-google/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -8,6 +8,7 @@
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = " gbmc-systemd-config"
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = " gbmc-iperf3"
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = " authorized-keys-comp"
+OBMC_IMAGE_EXTRA_INSTALL_append_gbmc_dev = " gbmc-dev-ssh-key"
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = \
   '${@"" if not d.getVar("GBMC_NCSI_IF_NAME") else " gbmc-ncsi-config"}'
 OBMC_IMAGE_EXTRA_INSTALL_append_gbmc = \