cluster/prodvider: rewrite against x509 lib for ed25519 support

This gets rid of cfssl for the kubernetes bits of prodvider, instead
using plain crypto/x509. This also allows to support our new fancy
ED25519 CA.

Change-Id: If677b3f4523014f56ea802b87499d1c0eb6d92e9
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1489
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/cluster/prodvider/BUILD.bazel b/cluster/prodvider/BUILD.bazel
index 81689c0..00dedc6 100644
--- a/cluster/prodvider/BUILD.bazel
+++ b/cluster/prodvider/BUILD.bazel
@@ -63,5 +63,5 @@
     format = "Docker",
     registry = "registry.k0.hswaw.net",
     repository = "q3k/prodvider",
-    tag = "{BUILD_TIMESTAMP}-{STABLE_GIT_COMMIT}",
+    tag = "1680301337",
 )