Create .spin/sqlite_db.db
only if needed
#1799
Merged
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Fixes #1791.
This follows the pattern from the
key-value-sqlite
crate.Note this moves creation failures to first use rather than trigger initialisation - I couldn't see a way around that without significant surgery and significant divergence from the established KV pattern. (But if there is one then it would be great to backport it to KV.)