Add CI package for aurora-au

I tried copying the patterns I saw in the `vcpkg-ci-blas` folder, but I
have no idea how to actually run the tests.

scripts/ci.baseline.txt

@@ -1237,6 +1237,7 @@ vcpkg-ci-arrow:x64-windows-static=pass
 vcpkg-ci-arrow:x64-windows-static-md=pass
 vcpkg-ci-arrow:x64-osx=pass
 vcpkg-ci-arrow:x64-linux=pass
+vcpkg-ci-aurora-au:x64-linux=pass
 vcpkg-ci-boost:arm-neon-android=pass
 vcpkg-ci-boost:arm64-android=pass
 vcpkg-ci-boost:arm64-uwp=pass

scripts/test_ports/vcpkg-ci-aurora-au/portfile.cmake

@@ -0,0 +1,10 @@
+SET(VCPKG_POLICY_EMPTY_PACKAGE enabled)
+
+vcpkg_find_acquire_program(PKGCONFIG)
+
+vcpkg_cmake_configure(
+    SOURCE_PATH "${CURRENT_PORT_DIR}/project"
+    OPTIONS
+        "-DPKG_CONFIG_EXECUTABLE=${PKGCONFIG}"
+)
+vcpkg_cmake_build()

scripts/test_ports/vcpkg-ci-aurora-au/project/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.29)
+
+project(vcpkg-ci-aurora-au LANGUAGES CXX)
+
+find_package(Au CONFIG REQUIRED)
+
+add_executable(test_au_client test_au_client.cc)
+target_link_libraries(test_au_client PRIVATE Au::au)
+target_compile_features(test_au_client PRIVATE cxx_std_14)

scripts/test_ports/vcpkg-ci-aurora-au/project/test_au_client.cc

@@ -0,0 +1,17 @@
+#include <iostream>
+
+#include "au/au.hh"
+#include "au/constants/speed_of_light.hh"
+#include "au/io.hh"
+#include "au/units/meters.hh"
+#include "au/units/seconds.hh"
+
+using ::au::SPEED_OF_LIGHT;
+using ::au::symbols::m;
+using ::au::symbols::s;
+
+int main(int argc, char **argv) {
+  std::cout << "Speed of light in m/s: " << SPEED_OF_LIGHT.as<int>(m / s)
+            << std::endl;
+  return 0;
+}

scripts/test_ports/vcpkg-ci-aurora-au/vcpkg.json

@@ -0,0 +1,12 @@
+{
+  "name": "vcpkg-ci-aurora-au",
+  "version-string": "ci",
+  "description": "Validates aurora-au",
+  "dependencies": [
+    "aurora-au",
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    }
+  ]
+}