gnu: Add emacs-build-farm.

* gnu/packages/emacs.scm (emacs-build-farm): New variable.

gnu/packages/emacs.scm

@@ -1722,6 +1722,32 @@ (define-public emacs-guix
 @code{M-x guix-help} command.")
     (license license:gpl3+)))
 
+(define-public emacs-build-farm
+  (package
+    (name "emacs-build-farm")
+    (version "0.2")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://gitlab.com/alezost-emacs/build-farm")
+                    (commit "fa7fa54901416fc5c216a5014394cbd73a61efc6")))
+              (file-name (string-append name "-" version "-checkout"))
+              (sha256
+               (base32
+                "1zw3pivma6cv9j7k7qm02jd6wnxmsc1v2mjcssd50im99zzrqflh"))))
+    (build-system emacs-build-system)
+    (propagated-inputs
+     `(("bui" ,emacs-bui)
+       ("magit-popup" ,emacs-magit-popup)))
+    (home-page "https://gitlab.com/alezost-emacs/build-farm")
+    (synopsis "Emacs interface for Hydra and Cuirass build farms")
+    (description
+     "This Emacs package provides an interface for Hydra and
+Cuirass (build farms used by Nix and Guix).  It allows you to look at
+various data related to the build farm projects, jobsets, builds and
+evaluations.  The entry point is @code{M-x build-farm} command.")
+    (license license:gpl3+)))
+
 (define-public emacs-d-mode
   (package
     (name "emacs-d-mode")