Add a flake.nix generating a docker image

flake.lock

@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1713520724,
+        "narHash": "sha256-CO8MmVDmqZX2FovL75pu5BvwhW+Vugc7Q6ze7Hj8heI=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "c5037590290c6c7dae2e42e7da1e247e54ed2d49",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1714906307,
+        "narHash": "sha256-UlRZtrCnhPFSJlDQE7M0eyhgvuuHBTe1eJ9N9AQlJQ0=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "25865a40d14b3f9cf19f19b924e2ab4069b09588",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,53 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    naersk = {
+      url = "github:nix-community/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, naersk }:
+    let
+      forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
+    in
+    rec {
+      packages = forAllSystems (system:
+        let
+          pkgs = import nixpkgs { inherit system; };
+          naersk' = pkgs.callPackage naersk { };
+        in
+        rec {
+          default = kit-timesheets;
+          kit-timesheets = naersk'.buildPackage {
+            root = ./.;
+          };
+          docker = pkgs.dockerTools.buildLayeredImage {
+            name = "garmelon/kit-timesheets";
+            tag = "latest";
+
+            contents = with pkgs; [
+              # Makes debugging the container a bit more pleasant
+              busybox
+              # Fontconfig is needed so typst will find fonts (renders a blank
+              # document otherwise)
+              fontconfig
+            ];
+
+            config = {
+              Entrypoint = [ "${kit-timesheets}/bin/kit_timesheets" ];
+              WorkingDir = "/tmp";
+              Env = [
+                # Fontconfig needs to be babysitted a bit in containers
+                "FONTCONFIG_FILE=${pkgs.fontconfig.out}/etc/fonts/fonts.conf"
+                "FONTCONFIG_PATH=${pkgs.fontconfig.out}/etc/fonts/"
+                # Useful for read-only containers, as fontconfig will create a
+                # cache there
+                "HOME=/tmp"
+              ];
+            };
+          };
+        }
+      );
+    };
+}