update linuxfr-board container to use the board-sse-linuxfr.org gem version 1.0.0

Author: Trim

deployment/linuxfr-board/Containerfile

@@ -1,33 +1,31 @@
 FROM  docker.io/ruby:3-slim-bookworm
 
-LABEL org.opencontainers.image.title="LinuxFr.org boards"
-LABEL org.opencontainers.image.description="Push notifications for chat rooms of LinuxFr"
+LABEL org.opencontainers.image.title="Board for LinuxFr.org"
+LABEL org.opencontainers.image.description="Users of the LinuxFr.org website can chat on a space called the board (« la tribune » in french). \
+This Ruby daemon notifies the users when something is said with Server-Sent Event / EventSource."
 LABEL org.opencontainers.image.source="https://github.com/linuxfrorg/board-sse-linuxfr.org"
-LABEL org.opencontainers.image.url="https://github.com/linuxfrorg/linuxfr.org/blob/master/Container.md"
+LABEL org.opencontainers.image.url="https://github.com/linuxfrorg/board-sse-linuxfr.org"
 LABEL org.opencontainers.image.licenses="AGPL-3.0-only"
 LABEL org.opencontainers.image.version="ruby3-bookworm"
 LABEL org.opencontainers.image.authors="Adrien Dorsaz <adrien@adorsaz.ch>"
 
 ARG UID=1200
 
-RUN apt-get update \
+RUN \
+  set -eux; \
+  IFS=$'\n\t'; \
+  apt-get update; \
   # Install dependencies \
-  && apt-get install -y --no-install-recommends \
-    build-essential git ruby ruby-dev \
-  && apt-get clean
+  apt-get install -y --no-install-recommends \
+    build-essential git ruby ruby-dev; \
+  apt-get clean;
 
 USER ${UID}
 WORKDIR /linuxfr-board
 ENV HOME=/linuxfr-board
 
 # Install board-linuxfr
-# RUN gem install board-linuxfr -v '~> 0.1.4'
-
-# Temporary build board-linuxfr from sources
-RUN git clone https://github.com/linuxfrorg/board-sse-linuxfr.org.git --branch ruby3 \
-  && cd board-sse-linuxfr.org \
-  && gem build board-linuxfr.gemspec \
-  && gem install ./board-linuxfr-*.gem
+RUN gem install board-sse-linuxfr.org -v '~> 1.0.0'
 
 # Clean development dependencies
 USER 0
@@ -36,4 +34,4 @@ RUN apt purge --autoremove -y build-essential git ruby-dev
 USER ${UID}
 EXPOSE 9000
 
-CMD ["board-linuxfr"]
+CMD ["board-sse-linuxfr.org"]