Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: esolitos

.github/workflows/mend.yml

@@ -122,6 +122,11 @@ jobs:
             exit 0
           fi
 
+          ARCH=$(uname -m)
+          case $ARCH in
+            x86_64) ARCH="amd64" ;;
+            aarch64) ARCH="arm64" ;;
+          esac
           CLI_URL="https://downloads.mend.io/cli/linux_${ARCH}/mend"
           curl -fsSL "${CLI_URL}" -o /tmp/mend
           sudo mv /tmp/mend /usr/local/bin/mend