Document that zstd:chunked is downgraded to zstd when encrypting

A part of containers/common#2117 . Signed-off-by: Miloslav Trmač <[email protected]>
containers · Sep 30, 2024 · bb35ad1 · bb35ad1
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diff --git a/docs/source/markdown/options/compression-format.md b/docs/source/markdown/options/compression-format.md
@@ -5,3 +5,4 @@
 #### **--compression-format**=**gzip** | *zstd* | *zstd:chunked*
 
 Specifies the compression format to use.  Supported values are: `gzip`, `zstd` and `zstd:chunked`.  The default is `gzip` unless overridden in the containers.conf file.
+`zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning in that case.