Fix grid client tests workflow GPG key installation (#4490)

Author: zaelgohary

.github/workflows/grid_client_tests.yml

@@ -36,9 +36,8 @@ jobs:
       - name: Install Yggdrasil and Add Peers
         run: |
           sudo apt-get update
-          sudo apt-get install dirmngr
-          gpg --fetch-keys https://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/key.txt
-          gpg --export 569130E8CA20FBC4CB3FDE555898470A764B32C9 | sudo apt-key add -
+          sudo apt-get install -y gnupg jq
+          curl -fsSL https://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/key.txt | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/yggdrasil.gpg
           echo 'deb http://neilalexander.s3.dualstack.eu-west-2.amazonaws.com/deb/ debian yggdrasil' | sudo tee /etc/apt/sources.list.d/yggdrasil.list
           sudo apt-get update
           wget https://github.com/yggdrasil-network/yggdrasil-go/releases/download/v0.5.4/yggdrasil-0.5.4-amd64.deb