t7004: factor out gpg setup

diff --git a/RelNotes b/RelNotes
index 403fb970379c478ed49c50488a39705afe11d188..6372427426d80b01b03437fd1a55fd412fb8f75d 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.5.2.1.txt
\ No newline at end of file
+Documentation/RelNotes/1.7.7.txt
\ No newline at end of file