gnu: Add go-github-com-opencontainers-image-spec.

* gnu/packages/golang-xyz.scm (go-github-com-opencontainers-image-spec): New variable.

Change-Id: I1c9a22c2bb242e20e3e065132e8aecb87a2905fc

gnu/packages/golang-xyz.scm

@@ -8945,6 +8945,36 @@ importantly, it provides tools and wrappers to work with hash.Hash-based
 digests with little effort.")
     (license (list license:asl2.0 license:cc-by-sa4.0))))
 
+(define-public go-github-com-opencontainers-image-spec
+  (package
+    (name "go-github-com-opencontainers-image-spec")
+    (version "1.1.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/opencontainers/image-spec")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "108jws0i4kbawcihprj3wxp3yqv7nrynkwzwmbz42sx8dmbfq0kc"))))
+    (build-system go-build-system)
+    (arguments
+     (list
+      #:skip-build? #t
+      #:import-path "github.com/opencontainers/image-spec"))
+    (propagated-inputs
+     (list go-github-com-opencontainers-go-digest
+           go-github-com-russross-blackfriday
+           go-github-com-xeipuuv-gojsonreference
+           go-github-com-xeipuuv-gojsonschema))
+    (home-page "https://github.com/opencontainers/image-spec")
+    (synopsis "OCI Image Format Specification")
+    (description
+     "The OCI Image Format project creates and maintains the software shipping
+container image format spec (OCI Image Format).")
+    (license license:asl2.0)))
+
 ;; XXX: Find a way to source from specification-runtime-spec.
 (define-public go-github-com-opencontainers-runtime-spec
   (package