Dockerfile: sort packages alphabetically

In order to make it easier to maintain, list the Debian packages
alphabetically.
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>

docker/Dockerfile

@@ -11,47 +11,47 @@ ENV HOME=/tmp
 
 # Kernel build-depends
 RUN apt-get update && apt-get install --no-install-recommends -y \
+    automake \
+    autoconf \
+    asciidoc-base \
+    bc \
     build-essential \
+    bison \
+    cpio \
     debhelper \
     dh-exec \
-    cpio \
-    kernel-wedge \
-    kmod \
-    bc \
-    libssl-dev:native \
-    asciidoc-base \
-    xmlto \
-    bison \
     flex \
+    gcc \
+    git \
     gcc-multilib \
+    kernel-wedge \
+    kmod \
     libaudit-dev \
     libbabeltrace-dev \
     libbabeltrace-ctf-dev \
     libdw-dev \
     libelf-dev \
+    libglib2.0-dev \
     libiberty-dev \
     libnewt-dev \
     libnuma-dev \
+    libpci-dev \
     libperl-dev \
-    libunwind8-dev \
-    python-dev \
-    autoconf \
-    automake \
+    libssl-dev:native \
     libtool \
-    libglib2.0-dev \
     libudev-dev \
+    libunwind8-dev \
     libwrap0-dev \
-    libpci-dev \
-    gcc \
-    git
+    python-dev \
+    xmlto
 
 # Cross-compiler toolchains
 RUN apt-get update && apt-get install --no-install-recommends -y \
-    gcc-arm-linux-gnueabihf \
-    gcc-aarch64-linux-gnu
+    gcc-aarch64-linux-gnu \
+    gcc-arm-linux-gnueabihf
 
 # Other tools needed to upload the artifacts from Jenkins
 RUN apt-get update && apt-get install --no-install-recommends -y \
-    ssh \
+    libnss-wrapper \
     rsync \
-    libnss-wrapper
+    ssh