gistfile1.txt

[ben@snarf dtest]$ cat Dockerfile
FROM alpine:latest
ADD https://github.com/just-containers/s6-overlay/releases/download/v1.19.1.1/s6-overlay-amd64.tar.gz /tmp/
RUN ls -la /tmp/

[ben@snarf dtest]$ docker build --no-cache -t foo/bar .
Sending build context to Docker daemon  2.048kB
Step 1/3 : FROM alpine:latest
 ---> 7328f6f8b418
Step 2/3 : ADD https://github.com/just-containers/s6-overlay/releases/download/v1.19.1.1/s6-overlay-amd64.tar.gz /tmp/
Downloading  1.713MB/1.713MB
 ---> 024f6c671e4c
Removing intermediate container 1fc48e541662
Step 3/3 : RUN ls -la /tmp/
 ---> Running in 84e4352359fc
total 28
drwxrwxrwt    1 root     root          4096 Jul 17 15:14 .
drwxr-xr-x    1 root     root          4096 Jul 17 15:14 ..
drwxr-xr-x    2 root     root          4096 Jan 22 15:08 bin
drwxr-xr-x    7 root     root          4096 Jan 22 15:14 etc
-rwxr-xr-x    1 root     root           369 Jan 22 15:14 init
drwxr-xr-x    2 root     root          4096 Jan 22 15:08 libexec
drwxr-xr-x    3 root     root          4096 Jan 22 15:08 usr
 ---> c02f48bd182a
Removing intermediate container 84e4352359fc
Successfully built c02f48bd182a
Successfully tagged foo/bar:latest