Fix reloading if files are replaced #1
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On linux inotify is tied to the inode, so if the files are replaced (rather than re-written in place) the previous code wouldn't be watching the new files. The fix instead watches the diretory and then reloads when filenames matching the original names are modified. Another issue I ran into was the vault agent having a small window between updating the certificate and key, so the reloading would always have a noisy "key and cert don't match" error. Fix this by always waiting 2 seconds after a change to do the reload.
Bump go and use go modules.
Logs were prefixed with "certman: " however this imposes an odd format on the logging. The injected logger is a better place to do any prefixing if desired or to perform structured logging, etc. The "certman: " prefix has been removed from all log lines.
Use shields.io for version badge in README.
BREAKING CHANGES: - Replace custom logger interface with standard log/slog - Remove public Logger() method in favor of WithLogger() option - Change constructor to accept functional options - Require Go 1.21+ for slog support Features: - Add WithLogger() and WithContext() functional options - Use context.Context for graceful shutdown - Structured logging with Info, Error, and Debug levels - Add comprehensive CLAUDE.md for AI-assisted development This modernizes the API to use Go's standard structured logging and provides a cleaner, more extensible interface through functional options pattern.
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