[gnome-build-meta/gnome-3-30] ci: use specific flatmanager checkout instead of master

[Jordan Petridis <jpetridis src gnome org>]

commit 4985b2da4885eb249deb57c0612ffb074026d61b
Author: Jordan Petridis <jordan centricular com>
Date:   Mon Jan 27 16:13:16 2020 +0200

    ci: use specific flatmanager checkout instead of master

 .gitlab-ci.yml | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 12e54102..e0375ab1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,6 +6,7 @@ variables:
   BST: "bst --config build.conf --log-file logs/build.log --colors"
   BST_SHA: '1.4.1-9-gc12c7f596f15842028a46fff0ad062b3b4e2988f'
   BST_EXTERNAL_SHA: '0.19.1-0-ge39a140f7a2cf128e382ffe9318580d3e8664976'
+  FLAT_MANAGER_SHA: '0.3.5-0-g754f9aa3b539191da395a53b710df1051772eda1'
   FLATPAK_BRANCH: "3.30"
   FLATPAK_SERVER_ADDRESS: 'gbm.gnome.org'
 
@@ -64,6 +65,7 @@ before_script:
 
   # flat-manager-client to push to flathub
   - git clone https://github.com/flatpak/flat-manager
+  - git -C flat-manager/ checkout $FLAT_MANAGER_SHA
 
 flathub-prepare:
   stage: prepare_flatpak