Use JSON import for environment variables

The env can be provided as a JSON list `[{"name": "PORT", "value": "8080"}]`.
The `dict2items` filter provided by ansible is _almost_ what we want, but it
keeps the value original types (a boolean is kept as a boolean in the JSON value).
Since environment variables are strings and `clever-tools` does not want to make
the implicit coercion for us, we need to do it ourselves.

filter_plugins/env_json_map.py

@@ -0,0 +1,8 @@
+#!/usr/bin/env python
+
+class FilterModule(object):
+  def filters(self):
+      return {'json_env_map': self.json_env_map}
+
+  def json_env_map(self, env):
+      return [{'name': k, 'value': str(v)} for k,v in env.items()]

tasks/deploy.yml

@@ -17,7 +17,7 @@
     CONFIGURATION_FILE: "{{ clever_login_file }}"
 
 - name: Push Environment
-  shell: "clever env import < {{ clever_app_confdir }}/env"
+  shell: "clever env import --json < {{ clever_app_confdir }}/env"
   args:
     chdir: "{{ clever_app_root }}"
   environment:

templates/env.j2

@@ -1,9 +1,10 @@
-{% for key, value in (clever_base_env | combine(clever_env)).items() %}
-{{ key }}={{ value | to_json }}
-{% endfor %}
-
-{%- if clever_haskell_entry_point %}
+{% set static_env = clever_base_env | combine(clever_env) %}
+{% set dynamic_env = {} %}
+{% if clever_haskell_entry_point %}
 {# Haskell only #}
 {# https://www.clever-cloud.com/doc/get-help/reference-environment-variables/#haskell #}
-CC_RUN_COMMAND={{'~/.local/bin/' + clever_haskell_entry_point | to_json }}
+{% set dynamic_env = { 'CC_RUN_COMMAND': '~/.local/bin/' + clever_haskell_entry_point } %}
 {% endif %}
+{# dict2items is not enough here, all the values have to be stringified #}
+{# git-blame this line for more explanations #}
+{{ static_env | combine(dynamic_env) | json_env_map | to_json }}