Add requestheader-client-ca.

nix/kubernetes/keys/package/k8s-requestheader-client-ca/files/requestheader-client-ca-csr.json

@@ -0,0 +1,16 @@
+{
+  "CN": "Kubernetes",
+  "key": {
+    "algo": "rsa",
+    "size": 2048
+  },
+  "names": [
+    {
+      "C": "US",
+      "L": "Portland",
+      "O": "Kubernetes",
+      "OU": "CA",
+      "ST": "Oregon"
+    }
+  ]
+}

nix/kubernetes/keys/package/k8s-requestheader-client-ca/package.nix

@@ -0,0 +1,30 @@
+# unpackPhase
+# patchPhase
+# configurePhase
+# buildPhase
+# checkPhase
+# installPhase
+# fixupPhase
+# installCheckPhase
+# distPhase
+{
+  stdenv,
+  sqlite,
+  cfssl,
+  k8s,
+  all_hostnames,
+  ...
+}:
+stdenv.mkDerivation (finalAttrs: {
+  name = "k8s-service-account";
+  nativeBuildInputs = [ cfssl ];
+  buildInputs = [ ];
+
+  unpackPhase = "true";
+
+  installPhase = ''
+    mkdir -p "$out"
+    cd "$out"
+    cfssl gencert -initca ${./files/requestheader-client-ca-csr.json} | cfssljson -bare requestheader-client-ca
+  '';
+})