Add service account.

nix/kubernetes/keys/package/k8s-service-account/package.nix

@@ -0,0 +1,35 @@
+# 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 \
+       -ca=${k8s.ca}/ca.pem \
+       -ca-key=${k8s.ca}/ca-key.pem \
+       -config=${./files/ca-config.json} \
+       -profile=kubernetes \
+       ${./files/service-account-csr.json} | cfssljson -bare service-account
+  '';
+})