chore: introduce flake

.direnv/flake-profile

+flake-profile-3-link
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.direnv/flake-profile-1-link

+/nix/store/aq8afyapzza1jwfcqg93a0v9rc8daafa-hello-2.12.1-env
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.direnv/flake-profile-2-link

+/nix/store/4mmf088cwn4m6ysv0wvrqfyc9ickk73n-bob-env
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.direnv/flake-profile-3-link

+/nix/store/rjlpb1dfqkx4ij5700s761mmfbs1pvkp-bob-env
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.envrc

+use flake

flake.lock

+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1688500189,
+        "narHash": "sha256-djYYiY4lzJOlXOnTHytH6BUugrxHDZjuGxTSrU4gt4M=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "78419edadf0fabbe5618643bd850b2f2198ed060",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

+
+{
+  description = "Bob: The HTML and HTML fragment builder";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }: 
+    let
+      systems = [ "x86_64-linux" "aarch64-linux" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);
+      makePackage = system: 
+        let
+          pkgs = import nixpkgs { inherit system; overlays = [ self.overlay ]; };
+        in
+          pkgs.bob;
+    in
+    {
+      overlay = final: prev: {
+        bob = final.buildGoModule {
+          name = "bob";
+          src = ././application/source; 
+          vendorSha256 = null; # Use "nix to-sri --type sha256" on the actual hash
+          doCheck = false;
+
+          buildFlagsArray = [
+            "-ldflags=-X main.Version=${self.lastModifiedDate}"
+          ];
+        };
+      };
+
+      defaultPackage = forAllSystems makePackage;
+
+      checks = {
+        test = forAllSystems makePackage;
+      };
+    };
+}