chore(db-con): use database password if present in env

Use the DATABASE_PASSWORD environment variable if it exists and use  it
in database connection.

This is the way.

Refs RATY-129

open_city_profile/settings.py

@@ -32,6 +32,7 @@
         str,
         "postgres://open_city_profile:open_city_profile@localhost/open_city_profile",
     ),
+    DATABASE_PASSWORD=(str, ""),
     CACHE_URL=(str, "locmemcache://"),
     EMAIL_URL=(str, "consolemail://"),
     SENTRY_DSN=(str, ""),
@@ -136,6 +137,9 @@
 # Ensure postgis engine
 DATABASES["default"]["ENGINE"] = "django.contrib.gis.db.backends.postgis"
 
+if env("DATABASE_PASSWORD"):
+    DATABASES["default"]["PASSWORD"] = env("DATABASE_PASSWORD")
+
 CACHES = {"default": env.cache()}
 vars().update(env.email_url())  # EMAIL_BACKEND etc.