build: fix config issue and update github actions

.github/workflows/check.yml

@@ -5,10 +5,10 @@ jobs:
   site:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: nixbuild/nix-quick-install-action@v5
-        with:
-          nix_version: 2.4pre20201205_a5d85d0
-          nix_conf: experimental-features = nix-command flakes
-      - name: nix build
+      - uses: actions/checkout@v3
+      - name: Check Nix flake inputs
+        uses: DeterminateSystems/flake-checker-action@v4 # This action
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v3
+      - name: Build site
         run: nix build -L .#site

config.toml

@@ -1,7 +1,7 @@
 base_url = "https://acm.umn.edu/"
 build_search_index = false
 compile_sass = true
-generate_feed = true
+generate_feeds = true
 feed_filename = "rss.xml"
 highlight_code = true
 title = "ACM UMN"

flake.nix

@@ -4,18 +4,30 @@
     utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, utils }:
-    utils.lib.eachDefaultSystem (system:
-      let pkgs = nixpkgs.legacyPackages.${system};
-      in {
+  outputs =
+    {
+      self,
+      nixpkgs,
+      utils,
+    }:
+    utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
         devShell = pkgs.mkShell { buildInputs = with pkgs; [ zola ]; };
         packages.site = pkgs.stdenv.mkDerivation {
           name = "site";
           src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
 
           buildInputs = with pkgs; [ zola ];
-          phases = [ "unpackPhase" "buildPhase" ];
+          phases = [
+            "unpackPhase"
+            "buildPhase"
+          ];
           buildPhase = "zola build -o $out";
         };
-      });
+      }
+    );
 }