justfile: Add a docs build command

Author: tcharding

justfile

@@ -21,6 +21,10 @@ fmt:
 format:
   cargo +$(cat ./nightly-version) fmt --all --check
 
+# Generate documentation.
+docsrs *flags:
+  RUSTDOCFLAGS="--cfg docsrs -D warnings -D rustdoc::broken-intra-doc-links" cargo +$(cat ./nightly-version) doc --all-features {{flags}}
+
 # Update the recent and minimal lock files.
 update-lock-files:
   contrib/update-lock-files.sh