Update hack/e2e/test.sh

Co-authored-by: Maël Valais <mael@vls.dev>

hack/e2e/test.sh

@@ -201,8 +201,10 @@ kubectl logs deployments/venafi-kubernetes-agent \
     | timeout 60 jq 'if .msg | test("Data sent successfully") then . | halt_error(0) end'
 set -o pipefail
 
-# Create a unique TLS Secret and wait for it to appear in the Venafi certificate inventory API
-commonname="venafi-kubernetes-agent-e2e.$(uuidgen)"
+# Create a unique TLS Secret and wait for it to appear in the Venafi certificate
+# inventory API. The case conversion is due to macOS' version of uuidgen which
+# prints UUIDs in upper case, but DNS labels need lower case characters.
+commonname="venafi-kubernetes-agent-e2e.$(uuidgen | tr '[:upper:]' '[:lower:]').example.com"
 openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout /tmp/tls.key -out /tmp/tls.crt -subj "/CN=$commonname" 2>/dev/null
 kubectl create secret tls "$commonname" --cert=/tmp/tls.crt --key=/tmp/tls.key -o yaml --dry-run=client | kubectl apply -f -