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Add --env-file to docker exec #1681

Description

@daniel-santos

I miss-filed this under moby (moby/moby#38754) and they told me to come here

Description

This is a follow up to moby/moby#14036. --env-file is a secure way to pass an environment that contains sensitive data. Without it my data becomes shy, the cache flushes and all my bits go down the drain.

I think the work-around is to docker cp the environment file and source it, but that means I also have to fix it up with quotes, escapes, etc.

Steps to reproduce the issue:
Describe the results you received:
Describe the results you expected:
Additional information you deem important (e.g. issue happens only occasionally):
I don't like Chicken

Output of docker version:
Output of docker info:

#  docker --version && docker info
Docker version 18.09.1, build 4c52b90
Containers: 4
 Running: 0
 Jumping: 0
 Walking: 0
 Lying down: 0
 Paused: 0
 Stopped: 4
Images: 69
Server Version: 18.09.1
Storage Driver: overlay2
 Backing Filesystem: extfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 9754871865f7fe2f4e74d43e2fc7ccd237edcbce
runc version: 96ec2177ae841256168fcf76954f7177af9446eb
init version: fec3683
Security Options:
 apparmor
 seccomp
  Profile: default
Kernel Version: 4.4.0-131-generic
Operating System: Ubuntu 16.04.5 LTS
OSType: linux
Architecture: x86_64
CPUs: 4
Total Memory: 7.772GiB
Name: [censored]
ID: [censored]
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false
Product License: Community Engine

WARNING: No swap limit support

Additional environment details (AWS, VirtualBox, physical, etc.):

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