feat: update Dockerfile for better external support

Author: devshawn

Dockerfile

@@ -1,6 +1,6 @@
-FROM openjdk:8-alpine
+FROM openjdk:8-slim
 
-RUN apk update && apk add bash && apk add python3
+RUN apt-get update && apt-get install -y python3 python3-pip curl
 
 COPY ./build/libs/kafka-dsf-all.jar /usr/local/bin/kafka-dsf-all.jar
 COPY ./kafka-dsf /usr/local/bin/kafka-dsf

kafka-dsf

@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 cd $(dirname $0)