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

Change-Id: Ie889372b9a7b439e04c1899c90753349440e727a
diff --git a/devtools/bazel-cache/prod.jsonnet b/devtools/bazel-cache/prod.jsonnet
index 9b65e95..b4a9b6e 100644
--- a/devtools/bazel-cache/prod.jsonnet
+++ b/devtools/bazel-cache/prod.jsonnet
@@ -49,7 +49,7 @@
                     },
                     containers_: {
                         auth: kube.Container("bazel-remote") {
-                            image: "buchgr/bazel-remote-cache",
+                            image: "registry.k0.hswaw.net/devtools/bazel-cache:latest",
                             volumeMounts_: {
                                 data: { mountPath: "/data" },
                             },