Add support for postgres, mariadb/mysql databases (#23)

* Add environment variables for Database configuration.
* Install postgres and mysql dependencies.
* Test refactoring
* Run tests for prosody with postgres and also for prosody with sqlite.
* Add tests that check if postgres or sqlite is used.

tests/docker-compose.yml

@@ -15,10 +15,39 @@ services:
       E2E_POLICY_WHITELIST: "admin@localhost, user1@localhost"
       LOG_LEVEL: debug
       PROSODY_ADMINS: "admin@localhost, admin2@localhost"
-    extra_hosts:
-      - "conference.localhost:127.0.0.1"
-      - "pubsub.localhost:127.0.0.1"
-      - "proxy.localhost:127.0.0.1"
-      - "upload.localhost:127.0.0.1"
     volumes:
       - ./certs:/usr/local/etc/prosody/certs
+
+  prosody_postgres:
+    image: prosody
+    restart: unless-stopped
+    ports:
+      - "5000:5000"
+      - "5222:5222"
+      - "5223:5223"
+      - "5269:5269"
+      - "5281:5281"
+    environment:
+      DOMAIN: localhost
+      E2E_POLICY_WHITELIST: "admin@localhost, user1@localhost"
+      LOG_LEVEL: debug
+      PROSODY_ADMINS: "admin@localhost, admin2@localhost"
+      #DB_DRIVER: "MySQL"
+      DB_DRIVER: "PostgreSQL"
+      DB_DATABASE: "prosody"
+      DB_HOST: "postgres"
+      DB_PORT: "5432"
+      DB_USERNAME: "prosody"
+      DB_PASSWORD: "prosody"
+    volumes:
+      - ./certs:/usr/local/etc/prosody/certs
+    depends_on:
+      - postgres
+
+  postgres:
+    image: postgres:13-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: prosody
+      POSTGRES_USER: prosody
+      POSTGRES_PASSWORD: prosody