Add Docker Compose configurations for Authentik and Gatus services; create example environment files for both services.

gatus/compose.yaml

@@ -0,0 +1,32 @@
+services:
+  postgres:
+    image: postgres
+    volumes:
+      - ./data/db:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    environment:
+      - POSTGRES_DB=gatus
+      - POSTGRES_USER=gatus
+      - POSTGRES_PASSWORD=sutagabc123
+    networks:
+      - gatus-web
+
+  gatus:
+    image: twinproduction/gatus:latest
+    restart: always
+    ports:
+      - "6060:8080"
+    environment:
+      - POSTGRES_USER=gatus
+      - POSTGRES_PASSWORD=sutagabc123
+      - POSTGRES_DB=gatus
+    volumes:
+      - ./config:/config
+    networks:
+      - gatus-web
+    depends_on:
+      - postgres
+
+networks:
+  gatus-web: