Update Dockerfile

.devcontainer/Dockerfile

@@ -1,6 +1,29 @@
 FROM mcr.microsoft.com/vscode/devcontainers/base:ubuntu-24.04
 
-ADD first-run-notice.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt
+# Add metadata
+LABEL maintainer="your-email@example.com"
+LABEL description="PHP development container with Inkscape"
 
+# Copy configuration files
+COPY first-run-notice.txt /usr/local/etc/vscode-dev-containers/first-run-notice.txt
+
+# Install dependencies in a single layer with cleanup
 RUN apt-get update -y && \
-    apt-get install -y php php-curl php-xml inkscape composer
+    apt-get install -y --no-install-recommends \
+        php \
+        php-curl \
+        php-xml \
+        php-mbstring \
+        php-zip \
+        inkscape \
+        composer \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /workspace
+
+# Verify installations
+RUN php --version && \
+    composer --version && \
+    inkscape --version