Added docker files.

Dockerfile

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+FROM debian:wheezy-slim
+
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 8756C4F765C9AC3CB6B85D62379CE192D401AB61 && \
+    echo deb http://deb.seadrive.org wheezy main | tee /etc/apt/sources.list.d/seafile.list && \
+    apt-get update -y && \
+    apt-get install -y seafile-cli procps curl && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /seafile-client
+
+COPY start.sh /seafile-client/start.sh
+
+RUN chmod +x /seafile-client/start.sh && \
+    useradd -U -d /seafile-client -s /bin/bash seafile && \
+    usermod -G users seafile && \
+    chown seafile:seafile -R /seafile-client && \
+    su - seafile -c "seaf-cli init -d /seafile-client"
+
+CMD ["./start.sh"]

docker-compose.yaml

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+version: '2'
+services:
+  seafile-client:
+    restart: always
+    image: gronis:seafile-client-docker
+    container_name: seafile-client
+    environment:
+      - LIBRARY_ID=<your-library-id-here>
+      - SERVER_URL=<server-url>
+      - SERVER_PORT=<server-port>
+      - USERNAME=<username>
+      - PASSWORD=<password>
+      - DATA_DIR=<directory-path-to-sync>
+    volumes:
+      - <host-volume-path>:<directory-path-to-sync>

start.sh

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+#!/bin/bash
+
+set -e
+set -u
+set -o pipefail
+
+DATA_DIR="${DATA_DIR:-/data}"
+SEAFILE_UID="${SEAFILE_UID:-1000}"
+SEAFILE_GID="${SEAFILE_GID:-1000}"
+
+get () {
+    NAME="$1"
+    JSON="$2"
+    # Tries to regex setting name from config. Only works with strings for now
+    VALUE=$(echo $JSON | grep -Po '"'"$NAME"'"\s*:\s*.*?[^\\]"+,*' | sed -n -e 's/.*: *"\(.*\)",*/\1/p')
+    # Use eval to ensure that nested expressens are executed (config points to environment var)
+    eval echo $VALUE
+}
+
+setup_lib_sync(){
+    if [ ! -d $DATA_DIR ]; then
+      echo "Using new data directory: $DATA_DIR"
+      mkdir -p $DATA_DIR
+      chown seafile:seafile -R $DATA_DIR
+    fi
+    TOKEN_JSON=$(curl -d "username=$USERNAME" -d "password=$PASSWORD" ${SERVER_URL}:${SERVER_PORT}/api2/auth-token/ 2> /dev/null)
+    TOKEN=$(get token "$TOKEN_JSON")
+    LIBS=(${LIBRARY_ID//:/ })
+    for i in "${!LIBS[@]}"
+    do
+      LIB="${LIBS[i]}"
+      LIB_JSON=$(curl -G -H "Authorization: Token $TOKEN" -H 'Accept: application/json; indent=4' ${SERVER_URL}:${SERVER_PORT}/api2/repos/${LIB}/ 2> /dev/null)
+      LIB_NAME=$(get name "$LIB_JSON")
+      LIB_DIR=${DATA_DIR}/${LIB_NAME}
+      if [ ! -d $LIB_DIR ]; then
+        echo "Syncing $LIB_NAME"
+        mkdir -p $LIB_DIR
+        chown seafile:seafile -R $LIB_DIR
+        su - seafile -c "seaf-cli sync -l \"$LIB\" -s \"${SERVER_URL}:${SERVER_PORT}\" -d $LIB_DIR -u \"$USERNAME\" -p \"$PASSWORD\""
+      fi
+    done
+}
+
+setup_uid(){
+    # Setup user/group ids
+    if [ ! "$(id -u seafile)" -eq "${SEAFILE_UID}" ]; then
+        # Change the SEAFILE_UID
+        usermod -o -u "${SEAFILE_UID}" -g "${SEAFILE_GID}" seafile
+    fi
+}
+
+keep_in_foreground() {
+  # As there seems to be no way to let Seafile processes run in the foreground we
+  # need a foreground process. This has a dual use as a supervisor script because
+  # as soon as one process is not running, the command returns an exit code >0
+  # leading to a script abortion thanks to "set -e".
+  while true
+  do
+    for SEAFILE_PROC in "ccnet" "seaf-daemon"
+    do
+      pkill -0 -f "${SEAFILE_PROC}"
+      sleep 1
+    done
+    su - seafile -c "seaf-cli status"
+    sleep 5
+  done
+}
+
+setup_uid
+su - seafile -c "seaf-cli start"
+setup_lib_sync
+keep_in_foreground