Compile a host's catalog in a base and a test environment over the
puppetserver API, then diff the two.
- add catalog-diff CLI with cobra flags, config precedence and exit codes
- add puppetserver mTLS client for POST /puppet/v4/catalog
- add pdbmux fact client
- add catalog normalisation, diff engine and text/JSON renderers
- add Makefile, nfpm RPM packaging and woodpecker pipelines
unkin-agent
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