remove nonessential stuff

- rules_docker
- boost
... and their deps.

test/BUILD.bazel

@@ -1,35 +1,9 @@
-load("@io_bazel_rules_docker//cc:image.bzl", "cc_image")
-
 cc_binary(
     name = "hello",
     srcs = ["hello.cpp"],
 )
 
-cc_image(
-    name = "hello_image",
-    binary = ":hello",
-)
-
-cc_binary(
-    name = "boost_exception",
-    srcs = ["boost_exception.cpp"],
-    copts = ["-fexceptions", "-frtti"],
-    deps = [
-        "@boost//:lexical_cast",
-    ],
-)
-
-cc_image(
-    name = "boost_exception_image",
-    binary = ":boost_exception",
-)
-
 cc_binary(
     name = "exception",
     srcs = ["exception.cpp"],
 )
-
-cc_image(
-    name = "exception_image",
-    binary = ":exception",
-)

test/boost_exception.cpp

@@ -1,20 +0,0 @@
-#include <iostream>
-
-#include <boost/lexical_cast.hpp>
-
-int main() {
-  std::cout << "about to cast \"1\" to double!" << std::endl;
-  std::cout << boost::lexical_cast<double>("1") << std::endl;
-
-  std::cout << "about to cast \"z\" to double, but expecting to catch bad_lexical_cast" << std::endl;
-  try {
-    std::cout << boost::lexical_cast<double>("z");
-    std::cout << "uh-oh, should have thrown an exception before here." << std::endl;
-  } catch (const boost::bad_lexical_cast &e) {
-    std::cout << "caught bad_lexical_cast" << std::endl;
-  }
-
-  std::cout << "about to cast \"z\" to double, should see an uncaught exception." << std::endl;
-  std::cout << boost::lexical_cast<double>("z");
-  std::cout << "uh-oh, should have thrown an exception before here." << std::endl;
-}