Update pica-etherpad/Dockerfile

pica-etherpad/Dockerfile

@@ -13,12 +13,10 @@ ENV NODE_ENV=${NODE_ENV_BUILD}
 
 # téléchargement d'Etherpad et de la page d'accueil dans une image temporaire
 FROM base as downloader
-RUN cat /etc/apt/sources.list && \
-    echo "deb http://security.debian.org/debian-security jessie/updates main contrib non-free" >> /etc/apt/sources.list && \
-    apt-get update && \
-    apt-get install -y curl -t jessie/updates && \
+RUN apt-get update && \
     apt-get install -y \
       git \
+      curl \
       gzip \
       libssl-dev \
       pkg-config \
@@ -29,10 +27,7 @@ RUN cat /etc/apt/sources.list && \
 
 USER node
 WORKDIR /opt/etherpad-lite
-RUN echo "deb http://security.debian.org/debian-security jessie/updates main contrib non-free" >> /etc/apt/sources.list && \
-    apt-get update && \
-    apt-get install curl -y -t jessie/updates && \
-    curl -SL https://github.com/ether/etherpad-lite/archive/${ETHERPAD_VERSION}.zip > etherpad.zip && \
+RUN curl -SL https://github.com/ether/etherpad-lite/archive/${ETHERPAD_VERSION}.zip > etherpad.zip && \
     unzip etherpad && \
     rm -Rf etherpad.zip etherpad-lite-${ETHERPAD_VERSION}/.git && \
     mv etherpad-lite-${ETHERPAD_VERSION}/* . && \