Replace fpm with nfpm for the newest platforms

fpm has had multiple Ruby gem dependency issues, and nfpm has better support
for code signing if we wanted to do that in the future. The rest of the
platforms may be migrated to nfpm later.

builder/Dockerfile.debian-11

@@ -6,15 +6,17 @@ RUN set -x \
   && export DEBIAN_FRONTEND=noninteractive \
   && echo 'deb-src http://deb.debian.org/debian bullseye main' >> /etc/apt/sources.list \
   && apt-get update \
-  && apt-get install -y gcc libcurl4-openssl-dev libicu-dev \
-     libopenblas-base libpcre2-dev make python3-pip ruby ruby-dev wget \
+  && apt-get install -y curl gcc libcurl4-openssl-dev libicu-dev \
+     libopenblas-base libpcre2-dev make python3-pip wget \
   && apt-get build-dep -y r-base
 
 RUN pip3 install awscli
 
 RUN chmod 0777 /opt
 
-RUN gem install fpm
+RUN curl -LO https://github.com/goreleaser/nfpm/releases/download/v2.18.1/nfpm_amd64.deb && \
+    apt install -y ./nfpm_amd64.deb && \
+    rm nfpm_amd64.deb
 
 # Override the default pager used by R
 ENV PAGER /usr/bin/pager