It's time to open up raw content blob download, from URLs like [[ https://archive.softwareheritage.org/api/1/content/sha1:adc83b19e793491b1c6ea0fd8b46cd9f32e592fc/raw/ | this ]].
For now, we'd like to allow download only of files that have been detected as being textual-ish, by swh-indexer.
(And yes, this means contents that haven't been processed yet by swh-indexer will not be available for download.)