[workerd-cxx] replace cargo.toml with cargo.bzl (#14)

This will let us reuse PACKAGES in all downstream places
(quite a few actually)

Author: mikea

.github/workflows/ci.yml

@@ -33,13 +33,7 @@ jobs:
       - run: bazel --version
       - run: bazel run demo --verbose_failures --noshow_progress ${{matrix.os == 'macos' && '--xcode_version_config=tools/bazel:github_actions_xcodes' || ''}}
       - run: bazel test ... --verbose_failures --noshow_progress ${{matrix.os == 'macos' && '--xcode_version_config=tools/bazel:github_actions_xcodes' || ''}}
-      - name: Check MODULE.bazel.lock up to date
-        run: git diff --exit-code
-      - run: bazel run //third-party:vendor
-        if: matrix.os == 'ubuntu'
-      - name: Check third-party/bazel up to date
-        run: git diff --exit-code
-        if: matrix.os == 'ubuntu'
+
 
   clippy:
     name: Clippy

justfile

@@ -0,0 +1,2 @@
+cargo-update:
+    bazel run //third-party:vendor

third-party/BUILD.bazel

@@ -1,11 +1,12 @@
 load("@rules_rust//crate_universe:defs.bzl", "crates_vendor")
+load("//third-party:cargo.bzl", "PACKAGES")
 
 crates_vendor(
     name = "vendor",
     cargo_lockfile = "//third-party:Cargo.lock",
     generate_build_scripts = True,
-    manifests = ["//third-party:Cargo.toml"],
     mode = "remote",
+    packages = PACKAGES,
     tags = ["manual"],
     vendor_path = "bazel",
 )