ROX-24040: Set Podman instead of Docker to fix RHEL8 builders

Author: ebensh

build_push_app_interface.sh

@@ -36,6 +36,9 @@ IMAGE_REPOSITORY="${QUAY_IMAGE_REPOSITORY:-app-sre/acs-fleet-manager}"
 PROBE_IMAGE_REPOSITORY="${PROBE_QUAY_IMAGE_REPOSITORY:-app-sre/acscs-probe}"
 EMAILSENDER_IMAGE_REPOSITORY="${PROBE_QUAY_IMAGE_REPOSITORY:-app-sre/acscs-emailsender}"
 
+# Support RHEL8 build images for App-Interface ci-ext
+DOCKER=podman
+
 source ./scripts/build_setup.sh
 
 # Push the image: