Add grafana alerts

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/docker/grafana-to-ntfy/default.nix

@@ -0,0 +1,37 @@
+{ pkgs, ... }:
+let
+  config = pkgs.writeTextDir "/etc/grafana-to-ntfy/Rocket.toml" (
+    builtins.readFile (
+      (pkgs.formats.toml { }).generate "Rocket.toml" {
+        global = {
+          port = 8080;
+          address = "0.0.0.0";
+        };
+      }
+    )
+  );
+in
+pkgs.dockerTools.buildImage {
+  name = "grafana-to-ntfy";
+  fromImage = pkgs.docker-image-base;
+
+  copyToRoot = pkgs.buildEnv {
+    name = "root";
+    paths = with pkgs; [
+      grafana-to-ntfy
+      config
+    ];
+    pathsToLink = [
+      "/bin"
+      "/etc"
+    ];
+  };
+
+  config = {
+    Entrypoint = [ "grafana-to-ntfy" ];
+    WorkingDir = "/etc/grafana-to-ntfy";
+    ExposedPorts = {
+      "8080/tcp" = { };
+    };
+  };
+}