Create docker app for deploy http hello server with conf.d, etcd and waiting script

test.dockerapp/docker-compose.yml

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+version: "3.6"
+services:
+  hello:
+    build:
+      context: ./test.dockerapp/http-echo-confd/
+      dockerfile: Dockerfile
+      args:
+        httpEchoServerVersion: ${image-version}
+        alpineVersion: ${alpine-version}
+    environment:
+      HTTPTEXT: ${response-text}
+      # etcdWait parameter
+      PLATFORM: ${etcdWait-platform}
+      MAX_RETRY: ${etcdWait-max-retry}
+      SLEEP_TIME: ${etcdWait-sleep-time}
+    ports:
+      - ${echo-port}:5678
+  
+  etcd:
+    image: bitnami/etcd
+    environment:
+      - ALLOW_NONE_AUTHENTICATION=yes
+      # - ETCD_ADVERTISE_CLIENT_URLS=http://0.0.0.0:2379
+    restart: always
+    ports:
+      - "2379:2379/tcp"
+
+volumes:
+  data-volume:
+    driver: local

test.dockerapp/http-echo-confd/Dockerfile

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+ARG httpEchoServerVersion="latest"
+ARG alpineVersion=3.7
+FROM hashicorp/http-echo:${httpEchoServerVersion} as echo
+
+EXPOSE 2379
+
+FROM golang:alpine${alpineVersion}
+
+ENV HTTPTEXT=${HTTPTEXT:-"Hello word"}
+ENV ETCDCTL_API=${etcdApiVersion:-3}
+ENV ETCD_VERSION=${etcdVersion:-3.3.11}
+
+COPY --from=echo /http-echo /usr/local/bin/http-echo
+ADD ./etcdWait.sh /usr/bin/etcdWait
+
+ARG etcdFolder=etcd-v$ETCD_VERSION-linux-amd64
+
+RUN apk add --no-cache wget && \
+    wget https://github.com/kelseyhightower/confd/releases/download/v0.16.0/confd-0.16.0-darwin-amd64 -o /usr/local/bin/confd && \
+    wget https://github.com/coreos/etcd/releases/download/v$ETCD_VERSION/${etcdFolder}.tar.gz && \
+    tar -zxvf ${etcdFolder}.tar.gz && \
+    mv $(pwd)/${etcdFolder}/etcdctl /usr/local/bin/etcdctl && \
+    chmod +x /usr/bin/etcdWait
+
+# confd -onetime -backend etcd && cat /tmp/myScript.conf && 
+CMD etcdWait && http-echo -text="$HTTPTEXT"

test.dockerapp/http-echo-confd/etcdWait.sh

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+#!/bin/sh
+
+PLATFORM=${PLATFORM:-"vm"}
+SLEEP_TIME=${SLEEP_TIME:-"5"}
+MAX_RETRY=${MAX_RETRY:-"10"}
+RETRY=1
+
+# check loaded status
+# @param $1 : platform's key
+check_status()
+{
+    ETCD_READY=$(etcdctl --endpoints http://etcd:2379 get /${1}/etcd/loaded)
+}
+
+# ETCDCTL_API=3 should be defined as a global variable
+check_status ${PLATFORM}
+while [[ -z "${ETCD_READY}" && ${RETRY} -le ${MAX_RETRY} ]]; do
+    echo "Waiting for ECTD init ... (try number ${RETRY})";
+    check_status ${PLATFORM}
+    sleep ${SLEEP_TIME};
+
+    RETRY=$(expr ${RETRY} + 1)
+done
+echo "ECTD init ready."

test.dockerapp/metadata.yml

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+# Version of the application
+version: 0.1.0
+# Name of the application
+name: test
+# A short description of the application
+description: 
+# Namespace to use when pushing to a registry. This is typically your Hub username.
+namespace: antoine
+# List of application maintainers with name and email for each
+maintainers:
+  - name: test
+    email: antoine.roux@zenika.com

test.dockerapp/parameters.yml

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+echo-port: 5678
+etcd-port: 2379
+
+etcdWait-platform: dev
+etcdWait-max-retry: 100
+etcdWait-sleep-time: 2
+
+response-text: Hello world custom
+
+etcdApiVersion: 3.3
+etcd-version: 3.3.11
+image-version: latest
+alpine-version: 3.7