e2e: verify all 4 cert files before generating

Instead of only checking for ca.crt, verify that all generated
certs exist on disk before running gen-certs.sh. This prevents
a subtle failure where one missing cert causes TLS handshake
errors during tests.

Signed-off-by: Lohit Kolluri <lohitkolluri@gmail.com>

Author: lohitkolluri

scripts/test/e2e/run

@@ -30,7 +30,15 @@ setup() {
     # The certs are baked into the tlsregistry and engine container images,
     # so they must exist on disk before docker compose up --build.
     # gen-certs.sh handles its own directory navigation.
-    if [ ! -f e2e/testdata/registry/certs/ca.crt ]; then
+    certdir=e2e/testdata/registry/certs
+    missing=0
+    for f in ca.crt ca.key tlsregistry.crt tlsregistry.key; do
+        if [ ! -f "${certdir}/${f}" ]; then
+            missing=1
+            break
+        fi
+    done
+    if [ "$missing" -eq 1 ]; then
         sh e2e/testdata/registry/certs/gen-certs.sh
     fi