buildconfig: support passing build config via stdin
#675
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This commit adds support for reading the build config via stdin. To do that the
-config
switch now supports-
and with that it will useos.Stdin
insteadof readin the file. Because we have no file extension to auto-detect the format only JSON is supported in this mode.This feature will be used by osbuild-composer when it adds bootc image mode integration.