pkgs: add woodpecker

This is just the same version as upstream, but following the `next`
version.

pkgs/woodpecker/frontend.nix

@@ -0,0 +1,57 @@
+{ lib, buildPackages, callPackage, fetchFromGitHub, fetchYarnDeps, mkYarnPackage }:
+let
+  common = callPackage ./common.nix { };
+
+  esbuild_0_17_12 = buildPackages.esbuild.overrideAttrs (oa: rec {
+    version = "0.17.12";
+
+    src = fetchFromGitHub {
+      owner = "evanw";
+      repo = "esbuild";
+      rev = "v${version}";
+      hash = "sha256-75qDQWAp6cmuXtq90oIIQCj5IKUoQxNARxhFo2Sm5mk=";
+    };
+
+    vendorHash = "sha256-+BfxCyg0KkDQpHt/wycy/8CTG6YBA/VJvJFhhzUnSiQ=";
+  });
+in
+mkYarnPackage {
+  pname = "woodpecker-frontend";
+  inherit (common) version;
+
+  src = "${common.src}/web";
+
+  packageJSON = ./woodpecker-package.json;
+  yarnLock = ./yarn.lock;
+
+  offlineCache = fetchYarnDeps {
+    yarnLock = ./yarn.lock;
+    hash = common.yarnHash;
+  };
+
+  ESBUILD_BINARY_PATH = lib.getExe esbuild_0_17_12;
+
+  buildPhase = ''
+    runHook preBuild
+
+    yarn --offline build
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    cp -R deps/woodpecker-ci/dist $out
+    echo "${common.version}" > "$out/version"
+
+    runHook postInstall
+  '';
+
+  # Do not attempt generating a tarball for woodpecker-frontend again.
+  doDist = false;
+
+  meta = common.meta // {
+    description = "Woodpecker Continuous Integration server frontend";
+  };
+}