Generate project SBOM in SPDX format

[ivankravets]

Generate Software bill of materials in the format that is already used for the package manifest, especially for the license field.

• SPDX Standard
• SPDX Schemas
• SPDX Format Examples

Proposed CLI:

pio project sbom --standard=spdx --format=json

[simogaspa84]

Hi @ivankravets Is this already implemented in platformio ? Thanks