add guix derivation and manifest

manifest.scm

+(define-module (guix walint)
+  #:use-module (guix download)
+  #:use-module (guix profiles)
+  #:use-module (gnu packages haskell)
+  #:use-module (gnu packages haskell-web)
+  #:use-module (gnu packages haskell-xyz)
+  #:use-module (guix packages)
+  #:use-module (guix git-download)
+  #:use-module (guix build-system haskell)
+  #:use-module (guix licenses)
+  #:use-module (srfi srfi-1))
+
+(define ghc-regex-base-newer
+  (package
+    (inherit ghc-regex-base)
+    (version "0.94.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://hackage.haskell.org/package/regex-base/regex-base-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "1ngdmmrxs1rhvib052c6shfa40yad82jylylikz327r0zxpxkcbi"))))))
+
+
+
+(define ghc-regex-tdfa-newer
+  (package
+    (inherit ghc-regex-tdfa)
+    (version "1.3.1.1")
+    (inputs `(("ghc-regex-base" ,ghc-regex-base-newer)
+              ("ghc-utf8-string" ,ghc-utf8-string)))
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://hackage.haskell.org/package/regex-tdfa/regex-tdfa-"
+             version ".tar.gz"))
+       (sha256
+        (base32
+         "1msrq31k4jmn2lmrdzn87jqarqhw265ca69rfg5jpa5adrzm3gmi"))))))
+
+(define-public walint
+  (package
+    (name "walint")
+    (version "0.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://stuebinm.eu/git/walint")
+             (commit "c93c266951ea40938efcb061b438ce95e9780fde")))
+       (sha256
+        (base32 "144ysxjg5qj7wirbs3pvwszarz156ba78mk873lrd6w4qxnq9kqy"))))
+    (build-system haskell-build-system)
+    (arguments '())
+    (inputs
+     `(("ghc" ,ghc)
+       ("ghc-aeson" ,ghc-aeson)
+       ("ghc-regex-tdfa" ,ghc-regex-tdfa-newer)
+       ("ghc-getopt-generics" ,ghc-getopt-generics)
+       ("ghc-aeson-pretty" ,ghc-aeson-pretty)
+       ("ghc-either" ,ghc-either)
+       ("ghc-extra" ,ghc-extra)
+       ("ghc-bytestring-builder" ,ghc-bytestring-builder)
+       ))
+    (home-page "https://stuebinm.eu/git/walint")
+    (synopsis "linter for workadventure maps")
+    (description
+     "linter for workadventure maps")
+    (license "undecided")))
+
+(packages->manifest
+ `(,walint))