devtools/bazel-cache: build from source, use docker_push

Change-Id: Ie889372b9a7b439e04c1899c90753349440e727a
diff --git a/devtools/bazel-cache/BUILD.bazel b/devtools/bazel-cache/BUILD.bazel
new file mode 100644
index 0000000..2781a59
--- /dev/null
+++ b/devtools/bazel-cache/BUILD.bazel
@@ -0,0 +1,10 @@
+load("@io_bazel_rules_docker//container:container.bzl", "container_push")
+
+container_push(
+    name = "push",
+    image = "@com_github_buchgr_bazel_remote//:bazel-remote-image",
+    format = "Docker",
+    registry = "registry.k0.hswaw.net",
+    repository = "devtools/bazel-cache",
+    tag = "latest",
+)