chore: set up CI

.github/workflows/nix.yml

@@ -0,0 +1,27 @@
+name: "Nix Build"
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ocamlVersion: [5_1]
+    steps:
+    - uses: actions/checkout@v2
+    - uses: cachix/install-nix-action@v21
+      with:
+        extra_nix_config: |
+          extra-substituters = https://anmonteiro.nix-cache.workers.dev
+          extra-trusted-public-keys = ocaml.nix-cache.com-1:/xI2h2+56rwFfKyyFVbkJSeGqSIYMC/Je+7XXqGKDIY=
+    - name: "Run Nix tests"
+      run: nix build .#
+

dune-project

@@ -25,4 +25,5 @@
  (depends
   (ocaml
    (>= "4.13.0"))
-  melange))
+  (melange
+   (>= "2.0.0"))))

flake.nix

@@ -24,6 +24,16 @@
           melange-src.overlays.default
         ];
         inherit (pkgs) nodejs_latest lib stdenv darwin;
+        mkShell = { inputsFrom, buildInputs ? [ ] }: pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            yarn
+            nodejs_latest
+          ] ++ (with pkgs.ocamlPackages; [
+            ocamlformat
+            merlin
+          ]);
+          inherit inputsFrom buildInputs;
+        };
       in
       rec {
         packages = {
@@ -36,15 +46,14 @@
             propagatedBuildInputs = with pkgs.ocamlPackages; [ melange ];
           };
         };
-        devShells.default = pkgs.mkShell {
-          inputsFrom = [ packages.default ];
-          nativeBuildInputs = with pkgs; [
-            yarn
-            nodejs_latest
-          ] ++ (with pkgs.ocamlPackages; [
-            ocamlformat
-            merlin
-          ]);
+        devShells = {
+          default = mkShell {
+            inputsFrom = [ packages.default ];
+          };
+          release = mkShell {
+            inputsFrom = [ packages.default ];
+            buildInputs = with pkgs; [ cacert curl ocamlPackages.dune-release git ];
+          };
         };
       });
 }

melange-fetch.opam

@@ -9,7 +9,7 @@ bug-reports: "https://github.com/melange-community/melange-fetch"
 depends: [
   "dune" {>= "3.8"}
   "ocaml" {>= "4.13.0"}
-  "melange"
+  "melange" {>= "2.0.0"}
   "odoc" {with-doc}
 ]
 build: [