throws out “everything” and currently does not accept any parameters.

To support Github Action build matrix, we would need to extract various combinations in JSON format with field names as below and possibility for various filtering including BOARD with regular expression or glob - to generate a list of all BOARDS=banana* …

Kernel compilation:

all BRANCH=${{env.BRANCH}}" "BOARD=${{env.BOARD}}"

U-boot compilation:

all BRANCH=${{env.BRANCH}}" "BOARD=${{env.BOARD}}"

Images:

all