misc: upx_testsuite; move podman directories into subdirectory

misc/podman/cross-compile-upx-ubuntu/10-create-image.sh

@@ -0,0 +1,19 @@
+#! /usr/bin/env bash
+## vim:set ts=4 sw=4 et:
+set -e; set -o pipefail
+argv0=$0; argv0abs="$(readlink -fn "$argv0")"; argv0dir="$(dirname "$argv0abs")"
+
+# create the image from Dockerfile
+# using a rootless Podman container
+
+# NOTE: this image is based on rebuild-stubs/upx-stubtools-20221212-v6,
+#   so you have to create that image first
+# WARNING: we install many packages, so the resulting image needs A LOT of disk space!
+image=upx-cross-compile-ubuntu2204-20230721-v1
+[[ $1 == --print-image ]] && echo "$image" && exit 0
+
+podman build -t "$image" -f "$argv0dir/Dockerfile" "$argv0dir"
+
+podman image list "$image"
+echo
+podman image tree "$image"