enter_chroot: Copy local Goma creds into the chroot.

Goma auth flow has recently changed, and creds are now stored at
~/.goma_client_oauth2_config. Copying those creds into the chroot
should let folk update goma from within the chroot.

BUG=none
TEST=cros-sdk

Change-Id: I392032b509ced5b5b2cfd6a47a7e09035cebb777
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2182023
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Tested-by: Ben Pastene <bpastene@chromium.org>
diff --git a/sdk_lib/enter_chroot.sh b/sdk_lib/enter_chroot.sh
index 489b7a6..f80e371 100755
--- a/sdk_lib/enter_chroot.sh
+++ b/sdk_lib/enter_chroot.sh
@@ -83,6 +83,7 @@
   .config/chrome_infra/auth/creds.json
   .gdata_cred.txt             # User/password for Google Docs on chromium.org
   .gdata_token                # Auth token for Google Docs on chromium.org
+  .goma_client_oauth2_config  # Auth token for Goma
   .inputrc                    # Preserve command line customizations
 )
 if [[ "${SUDO_USER:-${USER}}" == "chrome-bot" ]]; then