CI: set up dokku

Procfile

@@ -0,0 +1 @@
+web: mix phx.server

config/prod.exs

@@ -10,7 +10,7 @@ use Mix.Config
 # which you should run after static files are built and
 # before starting your production server.
 config :planner, PlannerWeb.Endpoint,
-  url: [host: "example.com", port: 80],
+  url: [port: 5000],
   cache_static_manifest: "priv/static/cache_manifest.json"
 
 # Do not print debug messages in production

config/prod.secret.exs

@@ -12,7 +12,7 @@ database_url =
     """
 
 config :planner, Planner.Repo,
-  # ssl: true,
+  ssl: true,
   url: database_url,
   pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")
 

elixir_buildpack.config

@@ -0,0 +1,2 @@
+elixir_version=1.10.3
+erlang_version=21.2.5

phoenix_static_buildpack.config

@@ -0,0 +1,2 @@
+# Node version
+node_version=10.20.1