Add Dockerfile an CI

.drone.yml

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+---
+kind: pipeline
+name: default
+
+steps:
+- name: test
+  image: docker:dind
+  volumes:
+  - name: dockersock
+    path: /var/run
+  commands:
+  - sleep 5 # give docker enough time to start
+  - docker ps -a
+  - ls -la
+
+services:
+- name: docker
+  image: docker:dind
+  privileged: true
+  volumes:
+  - name: dockersock
+    path: /var/run
+
+volumes:
+- name: dockersock
+  temp: {}

Dockerfile

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+FROM debian:buster-slim
+
+COPY helloworld.sh /
+
+ENTRYPOINT ["/helloworld.sh"]

helloworld.sh

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+#!/bin/bash
+
+echo "Hello World"