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

hauki/settings.py

@@ -51,6 +51,7 @@ def get_git_revision_hash() -> str:
  SYSTEM_DATA_SOURCE_ID=(str, "hauki"),
  LANGUAGES=(list, ["fi", "sv", "en"]),
  DATABASE_URL=(str, "postgres:///hauki"),
+ DATABASE_PASSWORD=(str, ""),
  TEST_DATABASE_URL=(str, ""),
  TOKEN_AUTH_ACCEPTED_AUDIENCE=(str, ""),
  TOKEN_AUTH_SHARED_SECRET=(str, ""),
@@ -100,6 +101,9 @@ def get_git_revision_hash() -> str:
 if env("TEST_DATABASE_URL"):
  DATABASES["default"]["TEST"] = env.db("TEST_DATABASE_URL")
 
+if env("DATABASE_PASSWORD"):
+ DATABASES["default"]["PASSWORD"] = env("DATABASE_PASSWORD")
+
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 
 AUTH_USER_MODEL = "users.User"