nix: do not build docker image, moved plcom and assets in their own nix modules

crates/plcom/assets.nix

@@ -0,0 +1,26 @@
+{
+  stdenvNoCC,
+  tailwindcss,
+  tailwindProjectRoot,
+  src,
+}:
+
+let
+  tailwindStylesheet = import ./tailwind.nix {
+    stdenvNoCC = stdenvNoCC;
+    tailwindcss = tailwindcss;
+    src = tailwindProjectRoot;
+    inputFile = "css/main.css";
+  };
+
+in
+stdenvNoCC.mkDerivation {
+  name = "plcom-assets";
+  src = src;
+  buildInputs = [ tailwindStylesheet ];
+  installPhase = ''
+    mkdir -p $out
+    cp -r $src/* $out/
+    cp ${tailwindStylesheet}/output.css $out/style.css
+  '';
+}

crates/plcom/default.nix

@@ -0,0 +1,59 @@
+{
+  libiconv,
+  lib,
+  pkg-config,
+  stdenv,
+  craneLib,
+}:
+
+let
+  commonArgs = {
+    src = lib.cleanSourceWith {
+      src = craneLib.path ./.; # The original, unfiltered source
+      filter =
+        path: type:
+        # Assets for codegen
+        (lib.hasSuffix ".json" path)
+        ||
+          # Default filter from crane (allow .rs files)
+          (craneLib.filterCargoSources path type);
+    };
+
+    strictDeps = true;
+
+    buildInputs =
+      [
+        # Add additional build inputs here
+      ]
+      ++ lib.optionals stdenv.isDarwin [
+        libiconv
+      ];
+
+    nativeBuildInputs = [
+      # Add extra native build inputs here, etc.
+      pkg-config
+    ];
+  };
+
+  # Build *just* the cargo dependencies
+  cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+  # Clippy
+  clippyArtifacts = craneLib.cargoClippy (
+    commonArgs
+    // {
+      inherit cargoArtifacts;
+      # Again we apply some extra arguments only to this derivation
+      # and not every where else. In this case we add some clippy flags
+      # cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+    }
+  );
+
+in
+craneLib.buildPackage (
+  commonArgs
+  // {
+    cargoExtraArgs = "-p plcom";
+    cargoArtifacts = clippyArtifacts;
+  }
+)