Add PHP memory limit documentation for Docker builds

- Document --build-arg PHP_MEMORY_LIMIT option for large projects
- Default is 1024M, can increase to 2048M or more as needed
- Update Dockerfile version label to 0.0.1
- Add notes in both English and Japanese sections

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -2,7 +2,7 @@ FROM php:8.3-cli-alpine
 
 LABEL maintainer="Security Linter Team"
 LABEL description="PHP/Laravel Security Linter - Static security analysis tool"
-LABEL version="1.0.0"
+LABEL version="0.0.1"
 
 # Build arguments
 ARG PHP_MEMORY_LIMIT=1024M

README.md

@@ -34,6 +34,13 @@ cd php-security-linter
 docker build -t php-security-linter:latest .
 ```
 
+**Note:** For large projects, you may need to increase the PHP memory limit:
+
+```bash
+# Build with 2GB memory limit (default: 1024M)
+docker build --build-arg PHP_MEMORY_LIMIT=2048M -t php-security-linter:latest .
+```
+
 **Step 2: Run**
 
 ```bash
@@ -361,6 +368,13 @@ cd php-security-linter
 docker build -t php-security-linter:latest .
 ```
 
+**注意:** 大規模なプロジェクトでは、PHPのメモリ制限を増やす必要がある場合があります：
+
+```bash
+# 2GBのメモリ制限でビルド（デフォルト: 1024M）
+docker build --build-arg PHP_MEMORY_LIMIT=2048M -t php-security-linter:latest .
+```
+
 **ステップ2: 実行**
 
 ```bash