Does not work correctly in pipx/uvx-style environments due to missing pip dependency

[cgranade]

When using uvx or uv tool install to run PlatformIO, many commands fail due to a missing dependency on pip:

$ mkdir esp-example
$ cd esp-example
$ uvx platformio init --board esp32s3usbotg
The following files/directories have been created in /home/cgranade/tmp/esp-example
include - Put project header files here
lib - Put project specific (private) libraries here
src - Put project source files here
platformio.ini - Project Configuration File
Resolving esp32s3usbotg dependencies...
Platform Manager: Installing espressif32
Downloading  [####################################]  100%
Unpacking  [####################################]  100%
Platform Manager: espressif32@6.12.0 has been installed!
Tool Manager: Installing espressif/toolchain-xtensa-esp32s3 @ 8.4.0+2021r2-patch5
Downloading  [####################################]  100%          
Unpacking  [####################################]  100%          
Tool Manager: toolchain-xtensa-esp32s3@8.4.0+2021r2-patch5 has been installed!
Tool Manager: Installing espressif/toolchain-riscv32-esp @ 8.4.0+2021r2-patch5
Downloading  [####################################]  100%          
Unpacking  [####################################]  100%          
Tool Manager: toolchain-riscv32-esp@8.4.0+2021r2-patch5 has been installed!
Tool Manager: Installing platformio/framework-arduinoespressif32 @ ~3.20017.0
Downloading  [####################################]  100%          
Unpacking  [####################################]  100%          
Tool Manager: framework-arduinoespressif32@3.20017.241212+sha.dcc1105b has been installed!
Tool Manager: Installing platformio/tool-esptoolpy @ ~2.40900.0
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/home/cgranade/.cache/uv/archive-v0/UqYPTk0VrTbywRTRcX1sL/bin/python: No module named pip


Please ensure that the following packages are installed:

sudo apt install python3-dev libffi-dev libssl-dev


Cleaning...
Tool Manager: tool-esptoolpy@2.40900.250804 has been installed!
MissingPackageManifestError: Could not find one of 'package.json' manifest files in the package

The problem can be confirmed by noting that re-running uvx with the pip dependency added manually causes the command to complete successfully:

$ uvx --with pip platformio init --board esp32s3usbotg
Installed 24 packages in 37ms
The following files/directories have been created in /home/cgranade/tmp/esp-example
include - Put project header files here
lib - Put project specific (private) libraries here
src - Put project source files here
platformio.ini - Project Configuration File
Resolving esp32s3usbotg dependencies...
Tool Manager: Installing platformio/tool-esptoolpy @ ~2.40900.0
Unpacking  [####################################]  100%
Collecting cryptography~=45.0.3
  Downloading cryptography-45.0.7-cp311-abi3-manylinux_2_34_x86_64.whl.metadata (5.7 kB)
Collecting ecdsa~=0.19.1
  Downloading ecdsa-0.19.1-py2.py3-none-any.whl.metadata (29 kB)
Collecting bitstring~=4.3.1
  Downloading bitstring-4.3.1-py3-none-any.whl.metadata (5.3 kB)
Collecting reedsolo~=1.7.0
  Downloading reedsolo-1.7.0-py3-none-any.whl.metadata (23 kB)
Collecting intelhex~=2.3.0
  Downloading intelhex-2.3.0-py2.py3-none-any.whl.metadata (2.7 kB)
Collecting cffi>=1.14 (from cryptography~=45.0.3)
  Downloading cffi-2.0.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.whl.metadata (2.6 kB)
Collecting six>=1.9.0 (from ecdsa~=0.19.1)
  Downloading six-1.17.0-py2.py3-none-any.whl.metadata (1.7 kB)
Collecting bitarray<4.0,>=3.0.0 (from bitstring~=4.3.1)
  Downloading bitarray-3.8.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl.metadata (34 kB)
Collecting pycparser (from cffi>=1.14->cryptography~=45.0.3)
  Downloading pycparser-2.23-py3-none-any.whl.metadata (993 bytes)
Downloading cryptography-45.0.7-cp311-abi3-manylinux_2_34_x86_64.whl (4.5 MB)
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 4.5/4.5 MB 90.3 MB/s  0:00:00
Downloading ecdsa-0.19.1-py2.py3-none-any.whl (150 kB)
Downloading bitstring-4.3.1-py3-none-any.whl (71 kB)
Downloading reedsolo-1.7.0-py3-none-any.whl (32 kB)
Downloading intelhex-2.3.0-py2.py3-none-any.whl (50 kB)
Downloading bitarray-3.8.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl (337 kB)
Downloading cffi-2.0.0-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.whl (215 kB)
Downloading six-1.17.0-py2.py3-none-any.whl (11 kB)
Downloading pycparser-2.23-py3-none-any.whl (118 kB)
Installing collected packages: reedsolo, intelhex, bitarray, six, pycparser, bitstring, ecdsa, cffi, cryptography
Successfully installed bitarray-3.8.0 bitstring-4.3.1 cffi-2.0.0 cryptography-45.0.7 ecdsa-0.19.1 intelhex-2.3.0 pycparser-2.23 reedsolo-1.7.0 six-1.17.0
Tool Manager: tool-esptoolpy@2.40900.250804 has been installed!
Tool Manager: Installing platformio/tool-scons @ ~4.40801.0
Downloading  [####################################]  100%
Unpacking  [####################################]  100%
Tool Manager: tool-scons@4.40801.0 has been installed!
Already up-to-date.
Project has been successfully initialized!

In particular, it appears that the platformio Python package takes a hard dependency on pip, but that that dependency is not listed at https://github.com/platformio/platformio-core/blob/develop/platformio/dependencies.py#L29 as called by https://github.com/platformio/platformio-core/blob/develop/setup.py#L37, such that uvx platformio creates a virtual environment that does not contain pip.