[librsvg-oci-images] Build rustc 1.29 image

[Jordan Petridis <jpetridis src gnome org>]

commit 6a0c63f820dd29f58db686b836ee31a678cfd3df
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Mon Oct 1 03:59:33 2018 +0000

    Build rustc 1.29 image

 .gitlab-ci.yml | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8d487b7..27602b4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -116,6 +116,12 @@ ubuntu 18.04 i386:
 
     <<: *distro_build
 
+rustc 1.28 9:
+    variables:
+      RUSTC_VERSION: "1.29.1"
+      TAG_VERSION: "1.29"
+    <<: *rustc
+
 rustc 1.28 8:
     variables:
       RUSTC_VERSION: "1.28.0"