[keyring] usign: add 21.02 release build pubkey

[LEDE Commits]

ynezz pushed a commit to keyring.git, branch master:
https://git.openwrt.org/49283916005d7868923d34ab34f14188cf74812d

commit 49283916005d7868923d34ab34f14188cf74812d
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Sat Feb 20 15:04:56 2021 +0100

    usign: add 21.02 release build pubkey
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 usign/2f8b0b98e08306bf | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/usign/2f8b0b98e08306bf b/usign/2f8b0b98e08306bf
new file mode 100644
index 0000000..559eda4
--- /dev/null
+++ b/usign/2f8b0b98e08306bf
@@ -0,0 +1,2 @@
+untrusted comment: Public usign key for 21.02 release builds
+RWQviwuY4IMGvwLfs6842A0m4EZU1IjczTxKMSk3BQP8DAQLHBwdQiaU