Add Forgejo action to build Docker image

flake.nix

@@ -4,9 +4,14 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     flutils.url = "github:numtide/flake-utils";
+
+    nginx = {
+      url = "github:nginx/nginx";
+      flake = false;
+    };
   };
 
-  outputs = { self, nixpkgs, flutils }: flutils.lib.eachDefaultSystem (system:
+  outputs = { self, nixpkgs, flutils, nginx }: flutils.lib.eachDefaultSystem (system:
     let
       pkgs = nixpkgs.legacyPackages.${system};
 
@@ -21,28 +26,73 @@
         dontUnpack = true;
         installPhase = "install -Dm755 ${./patch-feed-date.py} $out/bin/patch-feed-date";
       };
+
+      nginxPort = "80";
+      nginxConf = pkgs.writeText "nginx.conf" ''
+        user nobody nobody;
+        daemon off;
+        error_log /dev/stdout info;
+        pid /dev/null;
+        events {}
+        http {
+          access_log /dev/stdout;
+          include ${nginx.outPath}/conf/mime.types;
+
+          server {
+            listen ${nginxPort};
+            index index.html;
+            location / {
+              root ${self.packages.${system}.static-website};
+            }
+          }
+        }
+      '';
     in
     {
-      packages.static-website = pkgs.stdenv.mkDerivation {
-        name = "blog-pim";
-        src = ./src;
-        sourceRoot = "src";
+      packages = {
+        static-website = pkgs.stdenv.mkDerivation {
+          name = "blog-pim";
+          src = ./src;
+          sourceRoot = "src";
 
-        buildInputs = [
-          gems
-          gems.wrappedRuby
-          patch-feed-date
-        ];
+          buildInputs = [
+            gems
+            gems.wrappedRuby
+            patch-feed-date
+          ];
 
-        buildPhase = ''
-          bundle exec jekyll build
-        '';
+          buildPhase = ''
+            bundle exec jekyll build
+          '';
 
-        installPhase = ''
-          mkdir -p $out
-          cp -r _site/* $out/
-          patch-feed-date --file _site/feed.xml > $out/feed.xml
-        '';
+          installPhase = ''
+            mkdir -p $out
+            cp -r _site/* $out/
+            patch-feed-date --file _site/feed.xml > $out/feed.xml
+          '';
+        };
+
+        container-image = pkgs.dockerTools.buildLayeredImage {
+          name = "blog-pim";
+          tag = "latest";
+
+          contents = [
+            pkgs.fakeNss
+            pkgs.nginx
+          ];
+
+          extraCommands = ''
+            mkdir -p tmp/nginx_client_body
+            mkdir -p var/log/nginx
+          '';
+
+          config = {
+            Cmd = [ "nginx" "-c" nginxConf ];
+            ExposedPorts = {
+              "${nginxPort}/tcp" = { };
+            };
+          };
+        };
       };
     });
 }