Try the linuxserver image?

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-alpine
+FROM lscr.io/linuxserver/calibre:latest
 
 # set version label
 ARG VERSION
@@ -7,7 +7,8 @@ ARG FFF_RELEASE
 LABEL build_version="FFDL-Auto version:- ${VERSION} Calibre: ${CALIBRE_RELEASE} FFF: ${FFF_RELEASE}"
 
 ENV PUID="911" \
-    PGID="911"
+    PGID="911" \
+	GUIAUTOSTART="false"
 
 RUN set -x && \
     apk update && \
@@ -23,69 +24,28 @@ RUN set -x && \
     curl \
     dbus \
 	jq \
-	python3 \
+	python3.9 \
 	shadow
 	
-RUN set -x && \
-    addgroup --gid "$PGID" abc && \
-    adduser \
-        --gecos "" \
-        --disabled-password \
-        --no-create-home \
-        --uid "$PUID" \
-        --ingroup abc \
-        --shell /bin/bash \
-        abc 
 
-RUN echo "**** install calibre ****" && \
-  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); \
+RUN echo *** Install Packages *** && \
+	set -x && \
+	apt-get install --upgrade py-pillow && \
+    if [ -z ${FFF_RELEASE+x} ]; then \
+        python3.9 -m pip --no-cache-dir install FanFicFare; \
+    else \
+        python3.9 -m pip --no-cache-dir install --extra-index-url https://testpypi.python.org/pypi FanFicFare==${FFF_RELEASE}; \
     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 && \
-  /opt/calibre/calibre_postinstall && \
-  dbus-uuidgen > /etc/machine-id
+	python3.9 -m pip --no-cache-dir install pushbullet.py && \
+    ln -s /opt/calibre/calibredb /bin/calibredb
 
 RUN echo "**** cleanup ****" && \
+ apt-get clean && \
  rm -rf \
 	/tmp/* \
 	/var/lib/apt/lists/* \
 	/var/tmp/*
 
-RUN echo "**** s6 omsta;; ****" && \
-	set -ex && \
-    ARCH=`uname -m` && \
-    if [ "$ARCH" = "x86_64" ]; then \
-        s6_package="s6-overlay-amd64.tar.gz" ; \
-    elif [ "$ARCH" = "aarch64" ]; then \
-        s6_package="s6-overlay-aarch64.tar.gz" ; \
-    else \
-        echo "unknown arch: ${ARCH}" && \
-        exit 1 ; \
-    fi && \
-    wget -P /tmp/ https://github.com/just-containers/s6-overlay/releases/download/v2.2.0.3/${s6_package} && \
-    tar -xzf /tmp/${s6_package} -C / && \
-    rm -rf /tmp/*
-
-RUN echo *** Install Packages *** && \
-	set -x && \
-	apk add --no-cache --upgrade py-pillow && \
-    if [ -z ${FFF_RELEASE+x} ]; then \
-        python3 -m pip --no-cache-dir install FanFicFare; \
-    else \
-        python3 -m pip --no-cache-dir install --extra-index-url https://testpypi.python.org/pypi FanFicFare==${FFF_RELEASE}; \
-    fi && \
-	python3 -m pip --no-cache-dir install pushbullet.py && \
-    ln -s /opt/calibre/calibredb /bin/calibredb
-
 COPY root/ /
 
 VOLUME /config

release-versions/latest.txt

@@ -1 +1 @@
-2022.03.25-26
+2022.03.25-27