diff --git a/packaging/oci/Containerfile b/packaging/oci/Containerfile
index 7179620..6eaede0 100644
--- a/packaging/oci/Containerfile
+++ b/packaging/oci/Containerfile
@@ -1,15 +1,20 @@
 FROM registry.fedoraproject.org/fedora:42
 RUN set -eux; \
   microdnf -y install \
-  rubygems rpmbuild bsdtar
+  rubygems rpmbuild bsdtar mingw-nsis-base.x86_64 mingw32-nsis.noarch; \
+  microdnf clean all;
 
-RUN useradd -m -r -d /home/builder -s /bin/bash builder; \
+# create user with 999 UID/GID
+RUN set -eux; \
+  groupadd -g 999 builder && \
+  useradd -m -r -u 999 -g 999 -d /home/builder -s /bin/bash builder && \
   chown builder:builder /home/builder
 
 USER builder
 ENV PATH="/home/builder/bin:${PATH}"
 WORKDIR /home/builder
-RUN gem install fpm
+RUN set -eux; \
+  gem install fpm