bugfix: .env.example files updated. some minor changes in jwt strategy to avoid failing when .env files does not contain needed keys.

backend/docker-compose.postgres.yml

@@ -0,0 +1,29 @@
+# Local development Postgres only.
+# Run from backend/:  docker compose -f docker-compose.postgres.yml up -d
+#
+# Nest runs on your Mac/PC; use DATABASE_URL with host "localhost" (not "postgres").
+# Variables POSTGRES_* and POSTGRES_PORT are read from .env (see .env.example).
+
+services:
+  postgres:
+    image: postgres:15-alpine
+    container_name: dyolink-postgres-dev
+    restart: unless-stopped
+    ports:
+      - "${POSTGRES_PORT:-5432}:5432"
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-dyolink_user}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-password}
+      POSTGRES_DB: ${POSTGRES_DB:-dyolink_db}
+    volumes:
+      - dyolink_pgdata_dev:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+      start_period: 10s
+
+volumes:
+  dyolink_pgdata_dev:
+    name: dyolink_postgres_data_dev