Build using nix.

flake.nix

@@ -51,5 +51,42 @@
           };
         }
       );
+      packages = forAllSystems (
+        system:
+        let
+          overlays = [ (import rust-overlay) ];
+          pkgs = import nixpkgs {
+            inherit system overlays;
+          };
+          rustToolchain = pkgs.pkgsBuildHost.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        in
+        rec {
+          app = pkgs.rustPlatform.buildRustPackage {
+            pname = "webhook-bridge";
+            version = "0.0.0";
+            src = ./.;
+
+            # If you have a Cargo.lock file, use this:
+            cargoLock.lockFile = ./Cargo.lock;
+
+            nativeBuildInputs = [
+              pkgs.pkg-config
+            ];
+            buildInputs = [
+              pkgs.openssl
+            ];
+          };
+          docker_env = pkgs.buildEnv {
+            name = "webhook-bridge";
+            paths = with pkgs; [
+              app
+              bash
+              uutils-coreutils-noprefix
+              # toybox # Smaller than uutils-coreutils?
+            ];
+          };
+          default = app;
+        }
+      );
     };
 }