Add global parameters to tasks

[dmlemos]

Motivation

In my use case I'd like to setup shell flags across all tasks as to avoid specifying the flags in every task. It is a little bit worse when using switch conditionals.

Given the following tasks

task "download" {
  check = "..."
  apply  = <<EOF
    set -e
    ...
EOF

task "extract" {
  check = "..."
  apply  = <<EOF
    set -e
    ...
EOF

task "deploy" {
  check = "..."
  apply  = <<EOF
    set -e
    ...
}

Proposal

Taking the same implementation from terraform:

config {
  interpreter = "/bin/bash"
  flags = ["-e"]
  timeout = "30"
}

Particular useful for timeout.
Anything in config would apply globally to all tasks.