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@@ -20,65 +20,65 @@ FROM ${BASE_OS}:${OS_VERSION} as base
 # https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run
 RUN apt-get update && \
  apt-get install --yes --no-install-recommends \
-  # wget for `install-tl` script to download TeXLive, and other downloads.
-  wget \
-  # In a similar vein, `curl` is required by various tools, or is just very
-  # nice to have for various scripting tasks.
-  curl \
-  # wget/install-tl requires capability to check certificate validity.
-  # Without this, executing `install-tl` fails with:
-  #
-  # install-tl: TLPDB::from_file could not initialize from: https://<mirror>/pub/ctan/systems/texlive/tlnet/tlpkg/texlive.tlpdb
-  # install-tl: Maybe the repository setting should be changed.
-  # install-tl: More info: https://tug.org/texlive/acquire.html
-  #
-  # Using `install-tl -v`, found out that mirrors use HTTPS, for which the
-  # underlying `wget` (as used by `install-tl`) returns:
-  #
-  # ERROR: The certificate of '<mirror>' is not trusted.
-  # ERROR: The certificate of '<mirror>' doesn't have a known issuer.
-  #
-  # This is resolved by installing:
-  ca-certificates \
-  # Update Perl, otherwise: "Can't locate Pod/Usage.pm in @INC" in install-tl
-  # script; Perl is already installed, but do not use `upgrade`, see
-  # https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run
-  perl \
-  # Install `latexindent` Perl dependencies.
-  # Found these using this method: https://unix.stackexchange.com/a/506964/374985
-  # List of `latexindent` dependencies is here:
-  # https://latexindentpl.readthedocs.io/en/latest/appendices.html#linux,
-  # see also the helper script at
-  # https://github.com/cmhughes/latexindent.pl/blob/master/helper-scripts/latexindent-module-installer.pl
-  #
-  # Installing via Debian system packages because installing the modules via
-  # `cpanm` requires `gcc` and I wanted to avoid installing that (~200MB).
-  #
-  # YAML::Tiny:
-  libyaml-tiny-perl \
-  # File::HomeDir:
-  libfile-homedir-perl \
-  # Unicode:GCString:
-  libunicode-linebreak-perl \
-  # Log::Log4perl:
-  liblog-log4perl-perl \
-  # Log::Dispatch:
-  liblog-dispatch-perl \
-  # Usually, `latexmk` is THE tool to use to automate, in a `make`-like style,
-  # LaTeX (PDF) file generation. However, if that is not enough, the following
-  # will fill the gaps and cover all other use cases:
-  make \
-  # Get `envsubst` to replace environment variables in files with their actual
-  # values.
-  gettext-base \
-  # Using the LaTeX package `minted` for syntax highlighting of source code
-  # snippets. It's much more powerful than the alternative `listings` (which is
-  # pure TeX: no outside dependencies but limited functionality) but requires
-  # Python's `pygments` package:
-  python3 \
-  python3-pygments \
-  # Required to embed git metadata into PDF from within Docker container:
-  git
+ # wget for `install-tl` script to download TeXLive, and other downloads.
+ wget \
+ # In a similar vein, `curl` is required by various tools, or is just very
+ # nice to have for various scripting tasks.
+ curl \
+ # wget/install-tl requires capability to check certificate validity.
+ # Without this, executing `install-tl` fails with:
+ #
+ # install-tl: TLPDB::from_file could not initialize from: https://<mirror>/pub/ctan/systems/texlive/tlnet/tlpkg/texlive.tlpdb
+ # install-tl: Maybe the repository setting should be changed.
+ # install-tl: More info: https://tug.org/texlive/acquire.html
+ #
+ # Using `install-tl -v`, found out that mirrors use HTTPS, for which the
+ # underlying `wget` (as used by `install-tl`) returns:
+ #
+ # ERROR: The certificate of '<mirror>' is not trusted.
+ # ERROR: The certificate of '<mirror>' doesn't have a known issuer.
+ #
+ # This is resolved by installing:
+ ca-certificates \
+ # Update Perl, otherwise: "Can't locate Pod/Usage.pm in @INC" in install-tl
+ # script; Perl is already installed, but do not use `upgrade`, see
+ # https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#run
+ perl \
+ # Install `latexindent` Perl dependencies.
+ # Found these using this method: https://unix.stackexchange.com/a/506964/374985
+ # List of `latexindent` dependencies is here:
+ # https://latexindentpl.readthedocs.io/en/latest/appendices.html#linux,
+ # see also the helper script at
+ # https://github.com/cmhughes/latexindent.pl/blob/master/helper-scripts/latexindent-module-installer.pl
+ #
+ # Installing via Debian system packages because installing the modules via
+ # `cpanm` requires `gcc` and I wanted to avoid installing that (~200MB).
+ #
+ # YAML::Tiny:
+ libyaml-tiny-perl \
+ # File::HomeDir:
+ libfile-homedir-perl \
+ # Unicode:GCString:
+ libunicode-linebreak-perl \
+ # Log::Log4perl:
+ liblog-log4perl-perl \
+ # Log::Dispatch:
+ liblog-dispatch-perl \
+ # Usually, `latexmk` is THE tool to use to automate, in a `make`-like style,
+ # LaTeX (PDF) file generation. However, if that is not enough, the following
+ # will fill the gaps and cover all other use cases:
+ make \
+ # Get `envsubst` to replace environment variables in files with their actual
+ # values.
+ gettext-base \
+ # Using the LaTeX package `minted` for syntax highlighting of source code
+ # snippets. It's much more powerful than the alternative `listings` (which is
+ # pure TeX: no outside dependencies but limited functionality) but requires
+ # Python's `pygments` package:
+ python3 \
+ python3-pygments \
+ # Required to embed git metadata into PDF from within Docker container:
+ git
 
 # The `minted` LaTeX package provides syntax highlighting using the Python `pygmentize`
 # package. That package also installs a callable script, which `minted` uses, see