[gimp/wip/schumaml/add-ci-prepare-stage] build: add CI needs: clauses to deps for image builds to speed up subsequent builds

[Michael Schumacher <schumaml src gnome org>]

commit 48110263f6502a43cbd55a4afb4805517f823b19
Author: Michael Schumacher <schumaml gmx de>
Date:   Fri May 29 18:51:29 2020 +0200

    build: add CI needs: clauses to deps for image builds to speed up subsequent builds

 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e4aa6b688f..4036a3dca0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -103,6 +103,7 @@ deps-debian/testing:
     - meson --prefix="${INSTALL_PREFIX}" _build
     - ninja -C _build
     - ninja -C _build install
+  needs: ["build-image"]
 
 .gimp-debian/testing-base:
   stage: gimp
@@ -199,6 +200,7 @@ deps-win64:
     paths:
       - .local/
       - _deps/
+  needs: ["build-image-win64"]
 
 gimp-win64:
   stage: gimp
@@ -260,6 +262,7 @@ deps-win32:
     paths:
       - .local/
       - _deps/
+  needs: ["build-image-win32"]
 
 gimp-win32:
   stage: gimp