[add] added docker

Dockerfile

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+ARG RUBY_VERSION=2.7.2
+
+## BUILD ENV
+FROM ruby:${RUBY_VERSION}-alpine AS build_env
+ARG BUILD_PACKAGES="build-base curl-dev git"
+ARG DEV_PACKAGES="sqlite-dev"
+ARG RUBY_PACKAGES="tzdata"
+ARG RAILS_ROOT=/app
+ENV RAILS_ENV=production
+ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
+WORKDIR $RAILS_ROOT
+
+# install packages
+RUN apk update \
+    && apk upgrade \
+    && apk add --update --no-cache $BUILD_PACKAGES $DEV_PACKAGES $RUBY_PACKAGES
+
+# copy app and cleanup dev environment in case this is not a clean git clone
+COPY . .
+RUN rm -rf .bundle vendor .vendor tmp/* db/*.sqlite3 log/* spec
+
+# install gems
+RUN gem install bundler:2.2.9 \
+    && bundle config --global frozen 1 \
+    && bundle config --local path 'vendor/bundle' \
+    && bundle config set without 'development:test:assets' \
+    && bundle install -j4 --retry 3 \
+    # Remove unneeded files (cached *.gem, *.o, *.c)
+    && rm -rf vendor/bundle/ruby/*/cache/*.gem \
+    && find vendor/bundle/ruby/*/gems/ -name "*.c" -delete \
+    && find vendor/bundle/ruby/*/gems/ -name "*.o" -delete
+
+# remove folders not needed in resulting image
+RUN rm -rf tmp/cache app/assets vendor/assets spec docker
+
+## DEPLOY ENV
+FROM ruby:${RUBY_VERSION}-alpine
+ARG PACKAGES="tzdata sqlite-libs"
+ARG RAILS_ROOT=/app
+ENV RAILS_ENV=production
+ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
+ARG USER_UID=12001
+ARG USER_GID=12001
+ARG GROUP_NAME=ryndns
+ARG USER_NAME=ryndns
+WORKDIR $RAILS_ROOT
+
+# make user
+RUN set -eux; \
+    addgroup -g $USER_UID $GROUP_NAME; \
+    adduser -u $USER_UID -G $GROUP_NAME -s /sbin/nologin -D $USER_NAME;
+
+# install packages
+RUN apk update \
+    && apk upgrade \
+    && apk add --update --no-cache $PACKAGES
+
+# get app from build env and add entrypoint
+COPY --from=build_env $RAILS_ROOT $RAILS_ROOT
+COPY ./docker/files/entrypoint.sh /
+
+# create persistent folder and change permission of app
+RUN mkdir -p $RAILS_ROOT/data \
+ && chown -R $USER_NAME:$GROUP_NAME $RAILS_ROOT
+
+USER $USER_NAME
+
+EXPOSE 3000
+ENTRYPOINT ["/entrypoint.sh"]

docker-compose.yml

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+version: '3.7'
+
+services:
+  ryndns:
+    build:
+      context: .
+      args:
+        USER_UID: ${UID_PROXY:-12001}
+        USER_GID: ${UID_PROXY:-12001}
+    environment:
+      # set to run app in subdirectory
+      RAILS_RELATIVE_URL_ROOT: /rynDNS
+      # set custom api key prefix
+      #API_KEY_PREFIX: zW3If4s5
+      # set custom header name for api key
+      #API_KEY_HEADER: X-API-Key
+      # set to reset the admin account
+      #RAILS_RESET_ADMIN: 1
+      # set app to run as demo
+      #RAILS_API_DEMO: 1
+      # set cycle to reset demo data
+      #RAILS_DEMO_RESET: 300
+    restart: always
+    image: ryndns
+    container_name: ryndns
+    ports:
+      - "3000:3000"
+    volumes:
+      - ryndns:/app/data
+
+volumes:
+  ryndns:

docker/files/entrypoint.sh

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+#!/bin/sh
+
+##############################
+# configuration
+
+prefix_file="${API_PREFIX_FILE:-/app/data/api_prefix}"
+db_file="${RAILS_DB_PATH:-/app/data/rynDNS.sqlite3}"
+default_admin_file="${API_DEFAULT_KEY_FILE:-/app/data/api_default_admin}"
+rails_bin="${RAILS_BINARY:-/app/bin/rails}"
+demo_cycle="${RAILS_DEMO_RESET:-300s}"
+demo_prefix="zW3If4s5"
+seed_default_key_text="Created default admin with api_key" # for grep'ing the default admin key
+
+# end configuration
+##############################
+
+function log()
+{
+    local time=$(date +%F_%T)
+    local prefix="LOG"
+    case $1 in
+        ERR | ERROR)
+            prefix="ERR"
+            shift
+            ;;
+        WAR | WARNING)
+            prefix="WAR"
+            shift
+            ;;
+        INF | INFO)
+            prefix="INF"
+            shift
+            ;;
+    esac
+    local func=$1; shift
+    # remove any \n
+    #local text=$(echo "$@"| tr '\n' '#' | sed 's|#|\\n |g')
+    case "$logfile" in
+        "")
+            echo "[$time]:[$prefix]:[$0][$func]: $@" 2>&1
+            ;;
+        *)
+            echo "[$time]:[$prefix]:[$0][$func]: $@" >> $logfile
+            ;;
+    esac
+}
+
+function random_sting()
+{
+  echo -n "$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w "${1:-32}" | head -n 1)"
+}
+
+function get_prefix_file()
+{
+  if [ -f "$prefix_file" ]; then
+    echo -n "$(head -1 $prefix_file)"
+  else
+    new_prefix=$(random_sting 8)
+    log get_prefix_file no prefix file, generating new one
+    echo -n "$new_prefix" > "$prefix_file"
+    echo -n "$new_prefix"
+  fi
+}
+
+function set_api_prefix()
+{
+  if [ -z "$RAILS_API_KEY_PREFIX" ]; then
+    log set_api_prefix setting prefix from file
+    RAILS_API_KEY_PREFIX=$(get_prefix_file | tail -1)
+    export RAILS_API_KEY_PREFIX
+  else
+    log set_api_prefix saving prefix from ENV to file
+    echo -n "$RAILS_API_KEY_PREFIX" > "$prefix_file"
+  fi
+}
+
+function demo_cleaner()
+{
+    while true; do
+        log demo_cleaner cleaning up;
+        db_setup
+        # starting sleep in subshell to be able to quickly terminate
+        sleep $demo_cycle &
+        wait
+    done
+}
+
+function demo()
+{
+    if [ ! -z "$RAILS_API_DEMO" ]; then
+        log demo "setting prefix to $demo_prefix"
+        RAILS_API_KEY_PREFIX="$demo_prefix"
+        export RAILS_API_KEY_PREFIX
+        log demo "setting up demo cleaner, resetting every $demo_cycle"
+        demo_cleaner &
+    fi
+}
+
+function db_setup()
+{
+  if [ ! -f $db_file ]; then
+    log db_setup running first time migrations
+    echo "$($rails_bin db:migrate)"
+  fi
+  log db_setup seeding database
+  seed_log="$($rails_bin db:seed)"
+  echo "$seed_log"
+  # save default login to file
+  default_admin=$(echo "$seed_log" | grep "$seed_default_key_text")
+  [ "${#default_admin}" -gt 8 ] && echo -n "$default_admin"  > $default_admin_file
+  log db_setup "see \`docker exec \$CONTAINER cat $default_admin_file\` for initial admin api_key"
+}
+
+function main()
+{
+  set_api_prefix
+  log main prefix: $RAILS_API_KEY_PREFIX
+  db_setup
+  [ "$(id -u)" -eq 0 ] && log WARN main running server as root
+  demo
+  log main starting server
+  exec $rails_bin s
+}
+
+main "$@"