misc: update podman images

misc/rebuild-stubs-with-podman/Dockerfile

@@ -1,5 +1,5 @@
 FROM docker.io/library/ubuntu:22.04
-ENV UPX_CONTAINER_IMAGE_NAME=upx-stubtools-20221212-v1
+ENV UPX_CONTAINER_IMAGE_NAME=upx-stubtools-20221212-v2
 ARG DEBIAN_FRONTEND=noninteractive
 ENV LANG=C.UTF-8
 
@@ -13,8 +13,10 @@ RUN dpkg --add-architecture i386 \
         # the following packages are not required for rebuilding the stubs, but
         # they do make the image much more convenient and also allow building
         # the full UPX binary inside the container via CMake:
-        7zip bzip2 cmake elfutils file g++ htop libzstd-dev lzip lzop ninja-build p7zip \
-        patch patchelf pax-utils rsync screen unzip vim zip zlib1g-dev zsh zstd \
+        7zip bzip2 cmake elfutils file g++ gdb htop libzstd-dev lzip lzop ninja-build \
+        p7zip patch patchelf pax-utils rsync screen unzip vim zip zlib1g-dev zsh zstd \
+        # extra packages for compiling with "gcc -m32" and and "gcc -mx32":
+        gcc-multilib g++-multilib \
     && true
 
 # manually install compat libs from Ubuntu 16.04; REQUIRED