Sharing dependencies across environments

What kind of issue is this?

• [*] Feature Request.

Configuration

Operating system: Windows 11 Pro

PlatformIO Version (platformio --version): PlatformIO Core, version 6.1.4

Description of problem

Hi, I was wondering if it is possible to create a feature to allow sharing dependencies across environments. I have a project with several dependencies with the same version and they end up getting downloaded multiple times.

Steps to Reproduce

pio run

Actual Results

The above command will create:

.pio
'-libdeps
  '-env1
     `-ArduinoJson
  '-env2
     `-ArduinoJson

Expected Results

Something like:

.pio
'-libdeps
  '-env-shared
     `-ArduinoJson

If problems with PlatformIO Build System:

The content of platformio.ini:

[env]
platform = nordicnrf52
board = adafruit_feather_nrf52840
framework = arduino
lib_deps = 
    bblanchon/ArduinoJson@^6.19.4

[env:env1]

[env:env2]

Source file to reproduce issue:

#include <Arduino.h>

void setup() {
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
}

Additional info

Start with the supplied platformio.ini and run pio run to reproduce the duplicate .pio/libdeps/env1 and env2 directories. Trace the PlatformIO Core build-system and dependency-resolution entry points responsible for environment-specific library installation. Done means identical dependencies can be shared across environments without breaking either build, with coverage for the shown env1/env2 configuration.