Update PostgreSQL and RabbitMQ images to use Alpine variants (#810)

Co-authored-by: Alex Justesen <[email protected]>

Author: alexjustesen

stubs/pgsql.stub

@@ -1,5 +1,5 @@
 pgsql:
-    image: 'postgres:17'
+    image: 'postgres:17-alpine'
     ports:
         - '${FORWARD_DB_PORT:-5432}:5432'
     environment:

stubs/rabbitmq.stub

@@ -1,5 +1,5 @@
 rabbitmq:
-    image: 'rabbitmq:4-management'
+    image: 'rabbitmq:4-management-alpine'
     hostname: 'rabbitmq'
     ports:
         - '${FORWARD_RABBITMQ_PORT:-5672}:5672'