chore: add docker-compose configuration for Zitadel services and update .gitignore

- Introduced a new docker-compose.yml file to define services for Zitadel, including a PostgreSQL database and Mailhog for testing.
- Updated .gitignore to exclude the machinekey directory.

Author: JoseSzycho

.gitignore

@@ -16,3 +16,4 @@ public/dist
 /blob-report/
 /out
 /docker
+/machinekey

docker-compose.yml

@@ -0,0 +1,57 @@
+services:
+  zitadel:
+    # The user should have the permission to write to ./machinekey
+    user: "${UID:-1000}"
+    restart: 'always'
+    networks:
+      - 'zitadel'
+    image: 'ghcr.io/zitadel/zitadel:v3.3.0'
+    command: 'start-from-init --masterkey "MasterkeyNeedsToHave32Characters" --tlsMode disabled'
+    environment:
+      ZITADEL_DATABASE_POSTGRES_HOST: db
+      ZITADEL_DATABASE_POSTGRES_PORT: 5432
+      ZITADEL_DATABASE_POSTGRES_DATABASE: zitadel
+      ZITADEL_DATABASE_POSTGRES_USER_USERNAME: zitadel
+      ZITADEL_DATABASE_POSTGRES_USER_PASSWORD: zitadel
+      ZITADEL_DATABASE_POSTGRES_USER_SSL_MODE: disable
+      ZITADEL_DATABASE_POSTGRES_ADMIN_USERNAME: postgres
+      ZITADEL_DATABASE_POSTGRES_ADMIN_PASSWORD: postgres
+      ZITADEL_DATABASE_POSTGRES_ADMIN_SSL_MODE: disable
+      ZITADEL_EXTERNALSECURE: false
+      ZITADEL_FIRSTINSTANCE_MACHINEKEYPATH: /machinekey/zitadel-admin-sa.json
+      ZITADEL_FIRSTINSTANCE_ORG_MACHINE_MACHINE_USERNAME: zitadel-admin-sa
+      ZITADEL_FIRSTINSTANCE_ORG_MACHINE_MACHINE_NAME: Admin
+      ZITADEL_FIRSTINSTANCE_ORG_MACHINE_MACHINEKEY_TYPE: 1
+    depends_on:
+      db:
+        condition: 'service_healthy'
+    ports:
+      - '8080:8080'
+    volumes:
+      - ./machinekey:/machinekey
+
+  db:
+    restart: 'always'
+    image: postgres:17-alpine
+    environment:
+      PGUSER: postgres
+      POSTGRES_PASSWORD: postgres
+    networks:
+      - 'zitadel'
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready", "-d", "zitadel", "-U", "postgres"]
+      interval: '10s'
+      timeout: '30s'
+      retries: 5
+      start_period: '20s'
+
+  mailhog: # Mailhog is a fake local SMTP server for testing
+    image: mailhog/mailhog:latest
+    ports:
+      - '1025:1025'
+      - '8025:8025' # Web UI
+    networks:
+      - 'zitadel'
+
+networks:
+  zitadel: