Support for Docker exec

[airmoi]

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Description

Provisioning sometimes requires to run extra commands in a container using docker exec... For now we have to use null_ressource local/remote-exec to run "docker exec" commands which is not very handy as we always need to add all the "docker exec" stuff, pass the container name and so on... Would by great to add something like :

resource "docker_exec" "custom_commands" {
    container = docker_container.my_container.id
    trigger= ..
    count= ...
    command = "<any custom commands here>"
}

New or Affected Resource(s)

• docker_exec

Potential Terraform Configuration

resource "docker_container" "ftp" {
  image = some-ftp-image
  name  = my-ftp
  ...
}
resource "docker_exec" "custom_commands" {
    container = docker_container.my_container.id
    command = <<EOT
useradd ${var.ftp_user} ...
echo "Hello ${var.ftp_user}" > "/home/${var.ftp_user}/README.txt"
EOT
}