Reduce Docker image size

- Removed useless apt cache from layer 3
- Avoid installing apt recommended packages

The compressed image now weights 67 MB less (≈ -30% size).

Signed-off-by: JoeLametta <JoeLametta@users.noreply.github.com>

Dockerfile

@@ -1,52 +1,73 @@
 FROM debian:buster
 
-RUN apt-get update \
-  && apt-get install -y autoconf cdrdao curl eject flac gir1.2-glib-2.0 git libiso9660-dev \
-  libsndfile1-dev libtool locales make pkgconf python3-gi \
-  python3-musicbrainzngs python3-mutagen python3-pip python3-requests \
-  python3-ruamel.yaml python3-setuptools sox swig \
-  && pip3 install pycdio==2.1.0
+RUN apt-get update && apt-get install --no-install-recommends -y \
+    autoconf \
+    automake \
+    cdrdao \
+    bzip2 \
+    curl \
+    eject \
+    flac \
+    gir1.2-glib-2.0 \
+    git \
+    libiso9660-dev \
+    libsndfile1-dev \
+    libtool \
+    locales \
+    make \
+    pkgconf \
+    python3-dev \
+    python3-gi \
+    python3-musicbrainzngs \
+    python3-mutagen \
+    python3-pip \
+    python3-requests \
+    python3-ruamel.yaml \
+    python3-setuptools \
+    sox \
+    swig \
+    && apt-get clean && rm -rf /var/lib/apt/lists/* \
+    && pip3 --no-cache-dir install pycdio==2.1.0
 
 # libcdio-paranoia / libcdio-utils are wrongfully packaged in Debian, thus built manually
 # see https://github.com/whipper-team/whipper/pull/237#issuecomment-367985625
 RUN curl -o - 'https://ftp.gnu.org/gnu/libcdio/libcdio-2.1.0.tar.bz2' | tar jxf - \
-  && cd libcdio-2.1.0 \
-  && autoreconf -fi \
-  && ./configure --disable-dependency-tracking --disable-cxx --disable-example-progs --disable-static \
-  && make install \
-  && cd .. \
-  && rm -rf libcdio-2.1.0
+    && cd libcdio-2.1.0 \
+    && autoreconf -fi \
+    && ./configure --disable-dependency-tracking --disable-cxx --disable-example-progs --disable-static \
+    && make install \
+    && cd .. \
+    && rm -rf libcdio-2.1.0
 
 # Install cd-paranoia from tarball
 RUN curl -o - 'https://ftp.gnu.org/gnu/libcdio/libcdio-paranoia-10.2+2.0.0.tar.bz2' | tar jxf - \
-  && cd libcdio-paranoia-10.2+2.0.0 \
-  && autoreconf -fi \
-  && ./configure --disable-dependency-tracking --disable-example-progs --disable-static \
-  && make install \
-  && cd .. \ 
-  && rm -rf libcdio-paranoia-10.2+2.0.0
+    && cd libcdio-paranoia-10.2+2.0.0 \
+    && autoreconf -fi \
+    && ./configure --disable-dependency-tracking --disable-example-progs --disable-static \
+    && make install \
+    && cd .. \
+    && rm -rf libcdio-paranoia-10.2+2.0.0
 
 RUN ldconfig
 
 # add user
 RUN useradd -m worker -G cdrom \
-  && mkdir -p /output /home/worker/.config/whipper \
-  && chown worker: /output /home/worker/.config/whipper
+    && mkdir -p /output /home/worker/.config/whipper \
+    && chown worker: /output /home/worker/.config/whipper
 VOLUME ["/home/worker/.config/whipper", "/output"]
 
 # setup locales + cleanup
 RUN echo "LC_ALL=en_US.UTF-8" >> /etc/environment \
-  && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
-  && echo "LANG=en_US.UTF-8" > /etc/locale.conf \
-  && locale-gen en_US.UTF-8 \
-  && apt-get clean && apt-get autoremove -y
+    && echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen \
+    && echo "LANG=en_US.UTF-8" > /etc/locale.conf \
+    && locale-gen en_US.UTF-8
 
 # install whipper
 RUN mkdir /whipper
 COPY . /whipper/
 RUN cd /whipper && python3 setup.py install \
-  && rm -rf /whipper \
-  && whipper -v
+    && rm -rf /whipper \
+    && whipper -v
 
 ENV LC_ALL=en_US.UTF-8
 ENV LANG=en_US