gnu: Add rust-ct-logs-0.6.

* gnu/packages/crates-io.scm (rust-ct-logs-0.6): New variable.

gnu/packages/crates-io.scm

@@ -5987,6 +5987,22 @@ reallocations.")
 Transparency logs for use with sct crate.")
     (license (list license:asl2.0 license:isc license:expat))))
 
+(define-public rust-ct-logs-0.6
+  (package
+    (inherit rust-ct-logs-0.7)
+    (name "rust-ct-logs")
+    (version "0.6.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "ct-logs" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "04wiwiv4ghni3x2vni3z711mlz0ndqvh04vmdkbw3nr7zbsqcdjd"))))
+    (arguments
+     `(#:cargo-inputs
+       (("rust-sct" ,rust-sct-0.6))))))
+
 (define-public rust-ct-logs-0.3
   (package
     (inherit rust-ct-logs-0.7)