fix: remove unnecessary binary from container

backend/docker/benefit.Dockerfile

@@ -37,7 +37,7 @@ COPY --chown=default:root docker/ubi/centos9.repo /etc/yum.repos.d/centos9.repo
 RUN rpm --import https://www.centos.org/keys/RPM-GPG-KEY-CentOS-Official
 RUN dnf install -y xorg-x11-server-Xvfb compat-openssl11
 RUN wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6.1-3/wkhtmltox-0.12.6.1-3.fedora37.x86_64.rpm && dnf localinstall -y wkhtmltox-0.12.6.1-3.fedora37.x86_64.rpm
-RUN rm -f /etc/yum.repos.d/centos9.repo
+RUN rm -f /etc/yum.repos.d/centos9.repo && rm -f wkhtmltox-0.12.6.1-3.fedora37.x86_64.rpm && dnf clean all
 
 COPY --chown=default:root /benefit/ /app/
 # Mark the app directory as safe to get rid of git's