Fix the Calibre plugins in the docker image

Previously the Goodreads and WorldCat plugins were installed with for the root user while calibre ran as a normal user...

Dockerfile

@@ -1,26 +1,29 @@
 FROM debian:sid-slim
 
-WORKDIR /ebook-tools
-
 ENTRYPOINT ["bash"]
 
 RUN apt-get update && \
     apt-get --no-install-recommends -y install file less bash coreutils gawk sed grep calibre p7zip-full tesseract-ocr tesseract-ocr-osd tesseract-ocr-eng python-lxml poppler-utils catdoc djvulibre-bin locales curl ca-certificates && \
     rm -rf /var/lib/apt/lists/* && \
     localedef -i en_US -c -f UTF-8 en_US.UTF-8 && \
-    curl 'https://www.mobileread.com/forums/attachment.php?attachmentid=163537' > goodreads.zip && \
+    useradd -mUs /usr/bin/bash -u 1000 user && \
+    mkdir /ebook-tools && \
+    chown user:user /ebook-tools
+
+WORKDIR /ebook-tools
+
+ENV LANG="en_US.UTF-8" PATH="${PATH}:/ebook-tools"
+
+USER user
+
+RUN curl 'https://www.mobileread.com/forums/attachment.php?attachmentid=163537' > goodreads.zip && \
     sha256sum 'goodreads.zip' | grep -q 'c44f88222017aaad0aa1a674e69f46b309198269c7f13ebd671ae942052d45a8' && \
     calibre-customize --add-plugin goodreads.zip && \
     rm goodreads.zip && \
     curl -L 'https://github.com/na--/calibre-worldcat-xisbn-metadata-plugin/archive/0.1.zip' > worldcat.zip && \
     sha256sum worldcat.zip | grep -q 'bedddcd736382baf95fed2c38698ded15b0d8fbd8085bacd1a4b4766e972dd4d' && \
     7z x worldcat.zip && \
     calibre-customize --build-plugin calibre-worldcat-xisbn-metadata-plugin-0.1/ && \
-    rm -rf worldcat.zip calibre-worldcat-xisbn-metadata-plugin-0.1 && \
-    useradd -mUs /usr/bin/bash -u 1000 user
-
-USER user
-
-ENV LANG="en_US.UTF-8" PATH="${PATH}:/ebook-tools"
+    rm -rf worldcat.zip calibre-worldcat-xisbn-metadata-plugin-0.1
 
 COPY . /ebook-tools