Add bazel cpp example

bazel_cpp/.gitignore

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+venv
+bazel-*
+__pycache__
+MODULE.*

bazel_cpp/README.md

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+# Installation (currently only works on linux)
+
+* Install Bazelisk
+    * `wget https://github.com/bazelbuild/bazelisk/releases/download/v1.19.0/bazelisk-linux-amd64`
+    * `chmod +x bazelisk-linux-amd64`
+    * `sudo mv bazelisk-linux-amd64 /usr/local/bin/bazel`
+* `python3.11 -m venv venv --prompt modal-cpp-example`
+* `source venv/bin/activate`
+* `pip install modal`
+
+# Running example
+
+* `bazel build //main:hello-world --sandbox_add_mount_pair=/tmp`
+* `source venv/bin/activate`
+* `modal run run_binary_modal.py`

bazel_cpp/WORKSPACE

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+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "aspect_gcc_toolchain",
+    sha256 = "3341394b1376fb96a87ac3ca01c582f7f18e7dc5e16e8cf40880a31dd7ac0e1e",
+    strip_prefix = "gcc-toolchain-0.4.2",
+    urls = [
+        "https://github.com/aspect-build/gcc-toolchain/archive/refs/tags/0.4.2.tar.gz",
+    ],
+)
+
+load("@aspect_gcc_toolchain//toolchain:repositories.bzl", "gcc_toolchain_dependencies")
+
+gcc_toolchain_dependencies()
+
+load("@aspect_gcc_toolchain//toolchain:defs.bzl", "gcc_register_toolchain", "ARCHS")
+
+gcc_register_toolchain(
+    name = "gcc_toolchain_x86_64",
+    target_arch = ARCHS.x86_64,
+)

bazel_cpp/main/BUILD

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+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "hello-world",
+    srcs = ["hello-world.cc"],
+)

bazel_cpp/main/hello-world.cc

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+#include <ctime>
+#include <string>
+#include <iostream>
+
+std::string get_greet(const std::string& who) {
+  return "Hello " + who;
+}
+
+void print_localtime() {
+  std::time_t result = std::time(nullptr);
+  std::cout << std::asctime(std::localtime(&result));
+}
+
+int main(int argc, char** argv) {
+  std::string who = "world";
+  if (argc > 1) {
+    who = argv[1];
+  }
+  std::cout << get_greet(who) << std::endl;
+  print_localtime();
+  return 0;
+}

bazel_cpp/run_binary_modal.py

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+from modal import App, Mount
+import os
+
+app = App("example-modal-bazel-cpp")
+
+CWD = os.getcwd()
+LOCAL_REL_PATH= "bazel-bin/main/hello-world"
+REMOTE_PATH = "/root/my-binary"
+
+@app.function(mounts=[Mount.from_local_file(local_path=f"{CWD}/{LOCAL_REL_PATH}", remote_path=REMOTE_PATH)])
+def f():
+    import subprocess
+    subprocess.run(REMOTE_PATH)