Add bazel build

This will allow to consume global-refdb in gerrit build as additional
module.

Change-Id: I4626f49a2071f29329f91f03c7d69e696878ba57

BUILD

diff --git a/BUILD b/BUILD
new file mode 100644
index 0000000..be3ed79
--- /dev/null
+++ b/BUILD
@@ -0,0 +1,26 @@
+package(default_visibility = ["//visibility:public"])
+
+load("@rules_java//java:defs.bzl", "java_library")
+load("//tools/bzl:junit.bzl", "junit_tests")
+load(
+    "//tools/bzl:plugin.bzl",
+    "PLUGIN_DEPS",
+    "PLUGIN_DEPS_NEVERLINK",
+    "PLUGIN_TEST_DEPS",
+)
+
+java_library(
+    name = "global-refdb",
+    srcs = glob(["src/main/java/**/*.java"]),
+    deps = PLUGIN_DEPS_NEVERLINK,
+)
+
+junit_tests(
+    name = "global-refdb_tests",
+    size = "small",
+    srcs = glob(["src/test/java/**/*.java"]),
+    tags = ["global-refdb"],
+    deps = PLUGIN_DEPS + PLUGIN_TEST_DEPS + [
+        ":global-refdb",
+    ],
+)