gnu: Add rust-test-cert-gen-0.1.

* gnu/packages/crates-io.scm (rust-test-cert-gen-0.1): New variable.

gnu/packages/crates-io.scm

@@ -41412,6 +41412,26 @@ attribute.  Under the hood, all test cases that share same body are grouped
 into mod, giving clear and readable test results.")
     (license license:expat)))
 
+(define-public rust-test-cert-gen-0.1
+  (package
+    (name "rust-test-cert-gen")
+    (version "0.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "test-cert-gen" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1lrpirh863h9rq2iqp0kivshzwd909fgiy13a5684d685ap7c565"))))
+    (build-system cargo-build-system)
+    (arguments `(#:skip-build? #t))
+    (home-page "https://crates.io/crates/test-cert-gen")
+    (synopsis "Generate certificates for tests")
+    (description
+     "This package is an utility to generate certificates for tests (e.g.,
+for TLS).")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-tester-0.5
   (package
     (name "rust-tester")