overlays: add 'woodpecker-2.0.0-rc.0'

The point was initially to quickly test the release candidate and wait
for the official v2.

Unfortunately I've encountered some issues trying to get the package
working for the official version. So let's just roll with it for now...

overlays/woodpecker-2.0.0-rc.0/frontend.nix

@@ -0,0 +1,63 @@
+{ lib, buildPackages, callPackage, fetchFromGitHub, fetchYarnDeps, mkYarnPackage }:
+let
+  common = callPackage ./common.nix { };
+
+  esbuild_0_18_20 = buildPackages.esbuild.overrideAttrs (_: rec {
+    version = "0.18.20";
+
+    src = fetchFromGitHub {
+      owner = "evanw";
+      repo = "esbuild";
+      rev = "v${version}";
+      hash = "sha256-mED3h+mY+4H465m02ewFK/BgA1i/PQ+ksUNxBlgpUoI=";
+    };
+
+    vendorHash = "sha256-+BfxCyg0KkDQpHt/wycy/8CTG6YBA/VJvJFhhzUnSiQ=";
+  });
+in
+mkYarnPackage {
+  pname = "woodpecker-frontend";
+  inherit (common) version;
+
+  src = "${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_18_20;
+
+  postPatch = ''
+    substituteInPlace vite.config.ts \
+      --replace 'src/' '/build/web/deps/woodpecker-ci/src/' \
+      --replace 'node_modules/' '/build/web/node_modules/'
+  '';
+
+  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";
+  };
+}