feat: Add env var TASK_INIT_DIR to specify a custom --init template

[B13rg]

• I have read and followed the Contribution Guide

This pr adds an additional environment variable TASK_INIT_DIR, which specifies a directory or file to use with the --init command. Task will copy the Taskfile from this location instead of using the embedded template.

This should allow for simple init customization via .bashrc and more.

Related issue: #2012

Assisted by Claude Opus 4.5

Testing

Various tests showing operation

Default behavior with no configuration

~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> pwd                                                                         
/home/b13rg/github/go-task--task/dist/go-task--task_linux_amd64_v1

~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> cat ./example/Taskfile.yml           
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true

~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> TASK_INIT_DIR= ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml 
Taskfile created: Taskfile.yml
# yaml-language-server: $schema=https://taskfile.dev/schema.json

version: '3'

vars:
  GREETING: Hello, world!

tasks:
  default:
    desc: Print a greeting message
    cmds:
      - echo "{{.GREETING}}"
    silent: true

Specify directory path

> TASK_INIT_DIR=$(pwd)/example ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml 
Taskfile created: Taskfile.yml
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true

Specify complete file path

 ~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> TASK_INIT_DIR=$(pwd)/example/Taskfile.yml ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml
Taskfile created: Taskfile.yml
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true

Specify local directory path

 ~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> TASK_INIT_DIR=./example/Taskfile.yml ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml
Taskfile created: Taskfile.yml
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true

Specify path from `~` directory

 ~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> TASK_INIT_DIR=~/github/go-task--task/dist/go-task--task_linux_amd64_v1/example/Taskfile.yml ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml 
Taskfile created: Taskfile.yml
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true

Export env var before using

 ~/github/go-task--task/dist/go-task--task_linux_amd64_v1
> export TASK_INIT_DIR=~/github/go-task--task/dist/go-task--task_linux_amd64_v1/example/Taskfile.yml;
> ./task --init ; cat ./Taskfile.yml; rm ./Taskfile.yml
Taskfile created: Taskfile.yml
# https://taskfile.dev

version: '3'

vars:
  RESPONSE: The World says hello!

tasks:
  default:
    cmds:
      - echo "{{.RESPONSE}}"
    silent: true