simplify to single-stage build

Containerfile.custom

-#  ____        _ _     _           
-# | __ ) _   _(_) | __| | ___ _ __ 
-# |  _ \| | | | | |/ _` |/ _ \ '__|
-# | |_) | |_| | | | (_| |  __/ |   
-# |____/ \__,_|_|_|\__,_|\___|_|   
-#                                  
-FROM docker.io/fedora as builder
-
-# This will be used in ubi-micro
-RUN dnf --installroot=/tmp/ubi-micro \
-        --nodocs --setopt=install_weak_deps=False \
-        --releasever=40 \
-        install -y \
-        g++ shadow-utils && \
-    dnf --installroot=/tmp/ubi-micro \
-        clean all
+FROM docker.io/fedora
 
-# This is needed to build pict
 RUN dnf install -y cmake g++ && \
     mkdir /tmp/pict
 
-# Copy repo resources
-COPY ./ /tmp/pict/
+COPY ./ /pict/
 
-# Build the pict
-RUN cd /tmp/pict/ && \
+RUN cd /pict/ && \
     rm -rf build && \
     cmake -DCMAKE_BUILD_TYPE=Release -S . -B build && \
-    cmake --build build && \
-    cp build/cli/pict /tmp/ubi-micro/usr/local/bin/
-
-#  __  __       _       
-# |  \/  | __ _(_)_ __  
-# | |\/| |/ _` | | '_ \ 
-# | |  | | (_| | | | | |
-# |_|  |_|\__,_|_|_| |_|
-#
-FROM docker.io/fedora
-
-COPY --from=builder /tmp/ubi-micro/ /
-
-VOLUME /var/pict
-
-WORKDIR /var/pict
-
-RUN useradd -M pict
+    cmake --build build
 
-USER pict
+WORKDIR /pict/build/cli/
 
-ENTRYPOINT ["pict"]
+ENTRYPOINT ["pict"]
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