improve readme and nix file

Makefile

@@ -1,19 +0,0 @@
-BIN=guichet
-SRC=main.go ssha.go profile.go admin.go invite.go directory.go picture.go
-DOCKER=lxpz/guichet_amd64
-
-all: $(BIN)
-
-$(BIN): $(SRC)
-	go get -d -v
-	go build -v -o $(BIN)
-
-$(BIN).static: $(SRC)
-	go get -d -v
-	CGO_ENABLED=0 GOOS=linux go build -a -v -o $(BIN).static
-
-docker: $(BIN).static
-	docker build -t $(DOCKER):$(TAG) .
-	docker push $(DOCKER):$(TAG)
-	docker tag $(DOCKER):$(TAG) $(DOCKER):latest
-	docker push $(DOCKER):latest

README.md

@@ -27,9 +27,23 @@ Guichet is licensed under the terms of the GPLv3.
 
 Guichet requires go 1.13 or later.
 
-To build Guichet, clone this repository outside of your `$GOPATH`.
-Then, run `make` in the root of the repo.
+Development build:
 
+```
+go build
+```
+
+Production build:
+
+```
+nix build
+```
+
+Production container:
+
+```
+docker run .#docker
+```
 
 ## Configuration of Guichet
 

flake.nix

@@ -47,11 +47,20 @@
          Entrypoint = "/bin/guichet";
         };
       };
+
+      docker = pkgs.writeScriptBin "guichet-docker" ''
+        #!/usr/bin/env bash
+
+        set -euxo pipefail      
+        docker load <$(nix build --print-out-paths .#container)
+      '';
+
     in {
       packages.x86_64-linux.guichet = guichet;
       packages.x86_64-linux.container = container;
+      packages.x86_64-linux.docker = docker;
       packages.x86_64-linux.default = guichet;
-      
+
       devShell.x86_64-linux = pkgs.mkShell { nativeBuildInputs = [ pkgs.go pkgs.gomod2nix ]; };
     };
 }