OptionalbaseBase directory the serialized bytes are written to. Defaults to
resolveLocalArtifactBaseDir (env PS_ARTIFACT_DIR, else
<os.tmpdir()>/mj-ps-artifacts). Injectable so tests target a scratch dir.
OptionalcontentMIME content type recorded on the file (defaults to application/octet-stream).
OptionalproviderStorage-provider id to stamp on the MJ: Files row (ProviderID). Required in
practice — the column is NOT NULL — and supplied by buildArtifactStore
from the active MJ: File Storage Providers row.
Options for MJFilesArtifactStore.