feat: add post3 s3 proxy for postgresql

Signed-off-by: kjuulh <contact@kjuulh.io>

templates/docker-compose.yaml

@@ -0,0 +1,16 @@
+services:
+  postgres:
+    image: 'postgres:18-alpine'
+    restart: 'always'
+    shm_size: 128mb
+    environment:
+      POSTGRES_DB: post3_dev
+      POSTGRES_USER: devuser
+      POSTGRES_PASSWORD: devpassword
+    ports:
+      - '5435:5432'
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U devuser -d post3_dev"]
+      interval: 5s
+      timeout: 5s
+      retries: 5