Disable container signature verification by default

Author: ggiguash

test/bin/scenario.sh

@@ -26,7 +26,9 @@ VM_BOOT_TIMEOUT=1200 # Overall total boot times are around 15m
 VM_GREENBOOT_TIMEOUT=1800 # Greenboot readiness may take up to 15-30m depending on the load
 SKIP_SOS=${SKIP_SOS:-false}  # may be overridden in global settings file
 SKIP_GREENBOOT=${SKIP_GREENBOOT:-false}  # may be overridden in scenario file
-IMAGE_SIGSTORE_ENABLED=true # may be overridden in scenario file
+# Container image signature verification should be disabled by default in the
+# main branch because not all the images are signed
+IMAGE_SIGSTORE_ENABLED=false # may be overridden in scenario file
 VNC_CONSOLE=${VNC_CONSOLE:-false}  # may be overridden in global settings file
 TEST_RANDOMIZATION="all"  # may be overridden in scenario file
 TEST_EXECUTION_TIMEOUT="30m" # may be overriden in scenario file