Add 2 variations of Dockerfile

1. docker/root-with-sshd.Dockerfile
   - executes as user: "root"
   - supports build arguments:
     * api_key
     * root_password

2. docker/user-with-api-key.Dockerfile
   - executes as user: "libretranslate"
   - supports build arguments:
     * api_key

Build arguments are optional:

* api_key=""
  - initializes one API key with the user-defined value

* root_password=""
  - sets password for "root" user
  - installs sshd server to allow remote access to "ltmanage" command
    * enables "PermitRootLogin"
    * enables "PasswordAuthentication"

Environment variables with complimentary behavior:

* LT_REQ_LIMIT = 0
* LT_API_KEYS  = true
  - locks down server and requires an API key for all API access

Testing:

* unexpected complications
  - sudo:
    * error message:
        effective uid is not 0,
        is /usr/bin/sudo on a file system with the 'nosuid' option set
        or an NFS file system without root privileges?
    * info:
        https://unix.stackexchange.com/q/546822
    * result:
      - discarded Dockerfile variation that attempted to:
        * run entrypoint as user: "libretranslate"
        * use sudo to run sshd

* "render.com" free tier
  - notes:
    * completely free
    * no credit card required
    * can clone any public git repo and run any Dockerfile it contains
    * can NOT use SSH to access containers
  - Dockerfile variations:
    1. docker/Dockerfile
       - works perfectly
       - public API is open and unrestricted
    2. docker/root-with-sshd.Dockerfile
       - works perfectly
       - public API is only accessible to requests with "api_key"
       - SSH server is running
         * public access is blocked by container firewall
         * haven't tested on a paid tier,
           but external connections should be allowed and work
    3. docker/user-with-api-key.Dockerfile
       - works perfectly
       - public API is only accessible to requests with "api_key"

docker/root-with-sshd.Dockerfile

@@ -0,0 +1,105 @@
+FROM python:3.11.11-slim-bullseye AS builder
+
+WORKDIR /app
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN <<EOF
+  apt-get update -qq
+  apt-get -qqq install --no-install-recommends -y pkg-config gcc g++
+  apt-get upgrade --assume-yes
+  apt-get clean
+  rm -rf /var/lib/apt
+
+  python -mvenv venv
+  ./venv/bin/pip install --no-cache-dir --upgrade pip
+EOF
+
+COPY . .
+
+# Install package from source code, compile translations
+RUN <<EOF
+  ./venv/bin/pip install Babel==2.12.1
+  ./venv/bin/python scripts/compile_locales.py
+  ./venv/bin/pip install torch==2.2.0 --extra-index-url https://download.pytorch.org/whl/cpu
+  ./venv/bin/pip install "numpy<2"
+  ./venv/bin/pip install .
+  ./venv/bin/pip cache purge
+EOF
+
+FROM python:3.11.11-slim-bullseye
+
+ARG with_models=false
+ARG models=""
+
+ARG root_password=""
+ARG api_key=""
+
+ENV ENABLE_SSHD=${root_password:+true}
+
+RUN <<EOF
+  if [ "$ENABLE_SSHD" = "true" ]; then
+    # sshd
+    mkdir /var/run/sshd
+    apt-get update -qq
+    apt-get -qqq install --no-install-recommends -y openssh-server
+    apt-get clean
+    rm -rf /var/lib/apt
+
+    # sshd_config
+    echo "root:${root_password}" | chpasswd
+    sed -i 's/^#?\(PermitRootLogin\) .*$/\1 yes/'        /etc/ssh/sshd_config
+    sed -i 's/^#?\(PasswordAuthentication\) .*$/\1 yes/' /etc/ssh/sshd_config
+    sed -i 's/^#?\(UsePAM\) .*$/\1 no/'                  /etc/ssh/sshd_config
+  fi
+EOF
+
+COPY --from=builder --chown=root:root /app /app
+WORKDIR /app
+
+COPY --from=builder --chown=root:root /app/venv/bin/ltmanage /usr/bin/
+
+RUN <<EOF
+  if [ "$with_models" = "true" ]; then
+    # initialize the language models
+    if [ ! -z "$models" ]; then
+      ./venv/bin/python scripts/install_models.py --load_only_lang_codes "$models"
+    else
+      ./venv/bin/python scripts/install_models.py
+    fi
+  fi
+EOF
+
+RUN <<EOF
+  if [ ! -z "$api_key" ]; then
+    # initialize the API key database
+    ./venv/bin/python - <<'EOPython'
+from libretranslate.api_keys import Database
+from libretranslate.default_values import DEFAULT_ARGUMENTS as DEFARGS
+Database(DEFARGS['API_KEYS_DB_PATH'])
+EOPython
+
+    # initialize one API key
+    ltmanage keys add 120 --key "$api_key"
+  fi
+EOF
+
+EXPOSE 22
+EXPOSE 5000
+
+# entry point
+RUN <<EOF
+  cat >'/app/start.sh' <<EOENTRY
+#!/bin/sh
+set -e
+
+if [ "$ENABLE_SSHD" = "true" ]; then
+  service ssh start &
+fi
+
+/app/venv/bin/libretranslate --host '*'
+
+exit 0
+EOENTRY
+  chmod 755 /app/start.sh
+EOF
+ENTRYPOINT [ "/app/start.sh" ]

docker/user-with-api-key.Dockerfile

@@ -0,0 +1,78 @@
+FROM python:3.11.11-slim-bullseye AS builder
+
+WORKDIR /app
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN <<EOF
+  apt-get update -qq
+  apt-get -qqq install --no-install-recommends -y pkg-config gcc g++
+  apt-get upgrade --assume-yes
+  apt-get clean
+  rm -rf /var/lib/apt
+
+  python -mvenv venv
+  ./venv/bin/pip install --no-cache-dir --upgrade pip
+EOF
+
+COPY . .
+
+# Install package from source code, compile translations
+RUN <<EOF
+  ./venv/bin/pip install Babel==2.12.1
+  ./venv/bin/python scripts/compile_locales.py
+  ./venv/bin/pip install torch==2.2.0 --extra-index-url https://download.pytorch.org/whl/cpu
+  ./venv/bin/pip install "numpy<2"
+  ./venv/bin/pip install .
+  ./venv/bin/pip cache purge
+EOF
+
+FROM python:3.11.11-slim-bullseye
+
+ARG with_models=false
+ARG models=""
+
+ARG api_key=""
+
+RUN <<EOF
+  addgroup --system --gid 1032 libretranslate
+  adduser --system --uid 1032 libretranslate
+  mkdir -p /home/libretranslate/.local
+  chown -R libretranslate:libretranslate /home/libretranslate/.local
+EOF
+
+USER libretranslate
+
+COPY --from=builder --chown=1032:1032 /app /app
+WORKDIR /app
+
+COPY --from=builder --chown=1032:1032 /app/venv/bin/ltmanage /usr/bin/
+
+RUN <<EOF
+  if [ "$with_models" = "true" ]; then
+    # initialize the language models
+    if [ ! -z "$models" ]; then
+      ./venv/bin/python scripts/install_models.py --load_only_lang_codes "$models"
+    else
+      ./venv/bin/python scripts/install_models.py
+    fi
+  fi
+EOF
+
+RUN <<EOF
+  if [ ! -z "$api_key" ]; then
+    # initialize the API key database
+    ./venv/bin/python - <<'EOPython'
+from libretranslate.api_keys import Database
+from libretranslate.default_values import DEFAULT_ARGUMENTS as DEFARGS
+Database(DEFARGS['API_KEYS_DB_PATH'])
+EOPython
+
+    # initialize one API key
+    ltmanage keys add 120 --key "$api_key"
+  fi
+EOF
+
+EXPOSE 22
+EXPOSE 5000
+
+ENTRYPOINT [ "./venv/bin/libretranslate", "--host", "*" ]