Add crowdsec module and cs-firewall-bouncer package

packages/cs-firewall-bouncer/default.nix

@@ -0,0 +1,28 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+buildGoModule rec {
+  pname = "cs-firewall-bouncer";
+  version = "0.0.31";
+
+  src = fetchFromGitHub {
+    owner = "crowdsecurity";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-59MWll8v00CF4WA53gjHZSTFc8hpYaHENg9O7LgTCrA=";
+  };
+
+  vendorHash = "sha256-7Jxvg8UEjUxnIz1llvXyI2AefJ31OVdNzhWD/C8wU/Y=";
+
+  meta = with lib; {
+    homepage = "https://crowdsec.net/";
+    changelog = "https://github.com/crowdsecurity/${pname}/releases/tag/v${version}";
+    description = "Crowdsec bouncer for firewalls.";
+    longDescription = ''
+      crowdsec-firewall-bouncer will fetch new and old decisions from a CrowdSec API to add them in a blocklist used by supported firewalls.
+    '';
+    license = licenses.mit;
+  };
+}