[gimp] devel-docs: add an addition release step to test the package.

[Jehan <jehanp src gnome org>]

commit 0b1378f235fe41ef8c68954641c3fadd557fff06
Author: Jehan <jehan girinstud io>
Date:   Mon Jun 20 21:54:13 2022 +0200

    devel-docs: add an addition release step to test the package.
    
    We regularly have package issues which are discovered soon after
    release. Let's try a new step in the release process where we would
    build packages in advance just for testing.

 devel-docs/release-howto.txt | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/devel-docs/release-howto.txt b/devel-docs/release-howto.txt
index 8e97366f2f..2e9709fb57 100644
--- a/devel-docs/release-howto.txt
+++ b/devel-docs/release-howto.txt
@@ -40,6 +40,12 @@
      @harrymichal and @hfiguiere) of the upcoming release so they have
      some time to sort out issues with their builds.
 
+ ( ) Freeze the repository a few days before release, except for
+     absolute obvious bug fixes. Ask packagers to make a test package
+     based on current HEAD of the release branch. Post links to these
+     test packages on a bug report titled "GIMP X.Y.Z release testing".
+     Propose all willing testers to try these packages.
+
  ( ) Wait until the date specified in the announcements, use this time
      to get bug fixes applied which don't modify strings.