Build PlatformIO projects with an arbitrary source code structure. This will create a new temporary project which the source code will be copied into. More information: https://docs.platformio.org/en/latest/core/userguide/cmd_ci.html.
pio ci {{path/to/project}}
pio ci {{[-l|--lib]}} {{path/to/library_directory}} {{path/to/project}}
pio boards lists all of them):pio ci {{[-b|--board]}} {{board}} {{path/to/project}}
pio ci --build-dir {{path/to/build_directory}} {{path/to/project}}
pio ci --keep-build-dir {{path/to/project}}
pio ci {{[-c|--project-conf]}} {{path/to/platformio.ini}}