Continue moving personal packages from overlays

Continue moving out of the overlay model for everything and into running
sutff directly out of the packages. This should give a cleaner
separation of the things that I don't need to maintain separately

pkgs/create_ssl.nix

@@ -0,0 +1,32 @@
+{ writeShellApplication, openssl, ... }:
+
+writeShellApplication {
+  name = "create_ssl";
+  runtimeInputs = [ openssl ];
+  text = ''
+      set -e -o pipefail
+      name="''${1}"
+      root_key="''${2}"
+
+      function usage {
+    	  echo "USAGE: create_ssl <cert name> <root path>"
+      }
+
+      if [ -z "''${name}" ]; then
+    	  usage
+    	  exit 1
+      fi
+
+      if [ -z "''${root_key}" ]; then
+    	  usage
+    	  exit 1
+      fi
+
+      # Create the certificate key
+      openssl ecparam -out "''${name}.key" -name prime256v1 -genkey
+      # Create the CSR
+      openssl req -name -sha256 -key "''${name}.key" -out "''${name}.csr"
+      # Sign it
+      openssl x509 -req -in "''${name}.csr" -CA "''${root_key}.crt" -CAkey "''${root_key}.key" -CAcreateserial -out "''${name}.crt" -days 3650 -sha256
+  '';
+}