documize-community: init at 2.2.1

Documize is an open-source alternative for wiki software like Confluence
based on Go and EmberJS. This patch adds the sources for the community
edition[1], for commercial their paid-plan[2] needs to be used.

For commercial use a derivation that bundles the commercial package and
contains a `$out/bin/documize` can be passed to
`services.documize.enable`.

The package compiles the Go sources, the build process also bundles the
pre-built frontend from `gui/public` into the binary.

The NixOS module generates a simple `systemd` unit which starts the
service as a dynamic user, database and a reverse proxy won't be
configured.

[1] https://www.documize.com/get-started/
[2] https://www.documize.com/pricing/

pkgs/servers/documize-community/default.nix

@@ -0,0 +1,43 @@
+{ lib, buildGoPackage, fetchFromGitHub, go-bindata, go-bindata-assetfs }:
+
+buildGoPackage rec {
+  pname = "documize-community";
+  version = "2.2.1";
+
+  src = fetchFromGitHub {
+    owner = "documize";
+    repo = "community";
+    rev = "v${version}";
+    sha256 = "09s5js0zb3mh3g5qz8f3l2cqjn01kjb35kinfv932nf2rfyrmyqz";
+  };
+
+  goPackagePath = "github.com/documize/community";
+
+  buildInputs = [ go-bindata-assetfs go-bindata ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    pushd go/src/github.com/documize/community
+    go build -gcflags="all=-trimpath=$GOPATH" -o bin/documize ./edition/community.go
+    popd
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $bin/bin
+    cp go/src/github.com/documize/community/bin/documize $bin/bin
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Open source Confluence alternative for internal & external docs built with Golang + EmberJS";
+    license = licenses.agpl3;
+    maintainers = with maintainers; [ ma27 ];
+    homepage = https://www.documize.com/;
+  };
+}