Update Dockerfile

Dockerfile

@@ -38,24 +38,12 @@ RUN set -x && \
 		
 RUN echo "**** install calibre ****" && \
  set -x && \
- mkdir -p \
-	/opt/calibre && \
- if [ -z ${CALIBRE_RELEASE+x} ]; then \
-	CALIBRE_RELEASE=$(curl -sX GET "https://api.github.com/repos/kovidgoyal/calibre/releases/latest" \
-	| jq -r .tag_name); \
- fi && \
- CALIBRE_VERSION="$(echo ${CALIBRE_RELEASE} | cut -c2-)" && \
- CALIBRE_URL="https://download.calibre-ebook.com/${CALIBRE_VERSION}/calibre-${CALIBRE_VERSION}-x86_64.txz" && \
- curl -o \
-	/tmp/calibre-tarball.txz -L \
-	"$CALIBRE_URL" && \
- tar xvf /tmp/calibre-tarball.txz -C \
-	/opt/calibre && \
+ apt-get install calibre && \
  dbus-uuidgen > /etc/machine-id
  
 RUN echo "**** cleanup ****" && \
  rm -rf \
-	/tmp/*
+	/tmp/* \
 	/var/lib/apt/lists/* \
 	/var/tmp/*