chore: bootstrap independent git workflow

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docker-compose.demo.yml

@@ -0,0 +1,30 @@
+services:
+  postgres:
+    image: postgres:16
+    ports:
+      - "55432:5432"
+    environment:
+      POSTGRES_DB: dbtool_demo
+      POSTGRES_USER: dbtool
+      POSTGRES_PASSWORD: dbtool
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U dbtool -d dbtool_demo"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
+  mysql:
+    image: mysql:8.4
+    ports:
+      - "53306:3306"
+    environment:
+      MYSQL_DATABASE: dbtool_demo
+      MYSQL_USER: dbtool
+      MYSQL_PASSWORD: dbtool
+      MYSQL_ROOT_PASSWORD: dbtoolroot
+    command: ["mysqld", "--character-set-server=utf8mb4", "--collation-server=utf8mb4_unicode_ci"]
+    healthcheck:
+      test: ["CMD-SHELL", "mysqladmin ping -uroot -pdbtoolroot"]
+      interval: 5s
+      timeout: 5s
+      retries: 30