Tool: Docker entry node (#371)

* add docker based entry node

* disable analysis client plugin

tools/entry-node/.gitignore

+.env

tools/entry-node/README.md

+# Docker entry node
+
+This folder contains the scripts for running a GoShimmer entry node with Docker. 
+
+It builds the Docker image directly from the specified Git tag (such as `v0.1.3`, `master`, `af0ae41d5bfd607123e6cbae271da839a050b220`, ...) and does not depend on the locally checked out version.
+The GoShimmer DB is persisted in a named Docker volume.
+
+The entry node exposes the following ports on the host:
+- 14626/udp (Autopeering)
+- 188/tcp (Analysis Server)
+- 80/tcp (Analysis Visualizer)
+
+## How to run
+
+### Create the Docker volume
+Before starting an entry node for the specified git tag the first time, a Docker volume needs to be created.
+This is only needed once and can be done via the following command: 
+```sh
+TAG=tag ./create-volume.sh
+```
+The environment variable `TAG` contains the Git tag of the desired GoShimmer version.
+### Run the GoShimmer entry node
+To start the actual entry node, run the following: 
+```sh
+TAG=tag SEED=seed docker-compose up -d --build
+```
+The optional environment variable `SEED` contains the autopeering seed of the entry node in Base64 encoding.
+If `SEED` is not set, the seed will be taken from the DB (if present) in the volume.
+As such, `SEED` is only required once when setting or changing the seed of the entry node.
+
+Alternatively to providing the variables in the command, create the file `.env` in the base folder with the following content:
+```
+# Git tag of the entry node version
+TAG=tag
+
+# Autopeering seed used for the entry node
+SEED=seed
+```

tools/entry-node/create-volume.sh

+#!/usr/bin/env sh
+
+[ -z "$TAG" ] && echo "TAG not set" >&2 && exit 1
+
+# create docker volume and fix permissions
+docker run --rm -v entrynode_db-"$TAG":/volume busybox chown -R 65532:65532 /volume

tools/entry-node/docker-compose.yml

+version: "3"
+
+services:
+  entrynode:
+    image: "iotaledger/goshimmer-entrynode:${TAG}"
+    container_name: goshimmer-entrynode
+    build:
+      context: "https://github.com/iotaledger/goshimmer.git#${TAG}"
+    volumes:
+      - entrynode:/tmp/mainnetdb
+      - entrynode:/mainnetdb
+    ports:
+      - "1888:188/tcp"    # analysis server
+      - "8080:80/tcp"     # analysis HTTP server
+      - "14626:14626/udp" # autopeering discovery
+    restart: unless-stopped
+    command: >
+      --autopeering.seed=${SEED}
+      --autopeering.entryNodes=
+      --analysis.client.serverAddress=
+      --analysis.server.port=1888
+      --analysis.httpServer.bindAddress=0.0.0.0:8080
+      --node.disablePlugins=gossip,portcheck,spa,dashboard,webapi,webapibroadcastdataendpoint,webapifindtransactionhashesendpoint,webapigetneighborsendpoint,webapigettransactionobjectsbyhashendpoint,webapigettransactiontrytesbyhashendpoint
+
+volumes:
+  entrynode:
+    external:
+      name: entrynode_db-${TAG}