Missing STM32:stm32 platform when using core install

[syheliel]

Describe the problem

`I'm trying to compile the source code in https://github.com/RiS3-Lab/p2im-real_firmware/tree/master/Gateway, it involves the following code:

../deps/arduino-cli/arduino-cli compile -b STM32:stm32:Nucleo_64:pnum=NUCLEO_F103RB,upload_method=MassStorage,usb=none,opt=ogstd *.ino --build-path `realpath ./build` -o firmware

Then I know that I should install STM32:stm32, but it failed:

> arduino-cli core install STM32:stm32
Invalid argument passed: Found 0 platform for reference "STM32:stm32":

I checked my index through arduino-cli core list --all, I ensure that there are some other stuff except for STM32:stm32.

To reproduce

        wget https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_Linux_64bit.tar.gz -O "arduino-cli.tar.gz"
        tar xf arduino-cli.tar.gz
        rm arduino-cli.tar.gz
        rm LICENSE.txt
        arduino-cli core update-index
        arduino-cli core install STM32:stm32

Expected behavior

run this cmd successfully:

../deps/arduino-cli/arduino-cli compile -b STM32:stm32:Nucleo_64:pnum=NUCLEO_F103RB,upload_method=MassStorage,usb=none,opt=ogstd *.ino --build-path `realpath ./build` -o firmware

Arduino CLI version

arduino-cli Version: 0.34.2 Commit: 963c1a7 Date: 2023-09-11T10:05:42Z

Operating system

Linux

Operating system version

ubuntu22 in Docker

Additional context

No response

Issue checklist

• I searched for previous reports in the issue tracker
• I verified the problem still occurs when using the nightly build
• My report contains all necessary details

[per1234]

Hi @syheliel. You can learn how to install 3rd party boards platforms like STM32:stm32 by reading this section of the documentation:

https://arduino.github.io/arduino-cli/latest/getting-started/#adding-3rd-party-cores

If you have any additional questions or problems using Arduino CLI, please post on Arduino Forum, where we have a dedicated category just for that purpose:

https://forum.arduino.cc/c/software/arduino-cli/89

I'm sure we'll be able to help you out over there.