Add flake

.envrc

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+use flake

.gitignore

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+.direnv/*

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1732837521,
+        "narHash": "sha256-jNRNr49UiuIwaarqijgdTR2qLPifxsVhlJrKzQ8XUIE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "970e93b9f82e2a0f3675757eb0bfc73297cc6370",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Alertmanager to dbus notify bridge";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      allSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs allSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
+    in
+    {
+      overlays.default = final: prev: {
+        alerttonotify = self.packages.${prev.system}.default;
+      };
+
+      packages = forAllSystems (
+        { pkgs }:
+        {
+          default =
+            let
+              src = pkgs.lib.sourceFilesBySuffices ./. [
+                "go.mod"
+                "go.sum"
+                ".go"
+              ];
+              version = pkgs.lib.strings.removePrefix "v" (
+                builtins.elemAt (pkgs.lib.strings.split "\"" (
+                  pkgs.lib.lists.findFirst (x: pkgs.lib.strings.hasInfix "Version" x) null (
+                    pkgs.lib.strings.splitString "\n" (builtins.readFile ./main.go)
+                  )
+                )) 2
+              );
+            in
+            pkgs.buildGoModule {
+              version = version;
+              pname = "alerttonotify";
+              src = src;
+              vendorHash = pkgs.lib.fakeHash;
+            };
+        }
+      );
+      devShells = forAllSystems (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              go
+              golangci-lint
+            ];
+          };
+        }
+      );
+    };
+}

main.go

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+package main
+
+import "fmt"
+
+const Version = "v0.1.0"
+
+func main() {
+	fmt.Println("Hello!")
+}