rosenthal: Add go-github-com-duke-git-lancet-v2.

* rosenthal/packages/golang.scm (go-github-com-duke-git-lancet-v2): New
variable.

rosenthal/packages/golang.scm

@@ -29,6 +29,36 @@
     (description "This package provides a Go port of DiceBear Avatars.")
     (license license:expat)))
 
+(define-public go-github-com-duke-git-lancet-v2
+  (package
+    (name "go-github-com-duke-git-lancet-v2")
+    (version "2.1.13")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/duke-git/lancet")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "19v5hipcdsf2qc3vs0vhyigpjsym27lfxxdhry4ghwz1snf4zai4"))))
+    (build-system go-build-system)
+    (arguments
+     '(#:import-path "github.com/duke-git/lancet/v2"
+         ;; Source-only package
+         #:tests? #f
+         #:phases
+         (modify-phases %standard-phases
+           ;; Source-only package
+           (delete 'build))))
+    (home-page "https://pkg.go.dev/github.com/duke-git/lancet/v2")
+    (synopsis "Util function library of Go")
+    (description
+     "This package provides Lancet, a comprehensive, efficient, and reusable
+util function library of Go.  Inspired by the java apache common package and
+lodash.js.")
+    (license license:expat)))
+
 (define-public go-github-com-google-gopacket
   (package
     (name "go-github-com-google-gopacket")