deployment improvments

Dockerfile

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+# Use latest official Ubuntu image
+FROM ubuntu:latest
+
+# Set timezone
+ENV TZ=Europe/Berlin
+
+# Configure timezone data during build
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+# Avoid interactive prompts during apt install
+ARG DEBIAN_FRONTEND=noninteractive
+
+# Install Apache, PHP and required extensions
+RUN apt-get update && apt-get install -y \
+  apache2 \
+  apache2-utils \
+  ca-certificates \
+  php \
+  libapache2-mod-php \
+  php-curl \
+  php-dom \
+  php-gd \
+  php-intl \
+  php-json \
+  php-mbstring \
+  php-xml \
+  php-zip && \
+  apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Ensure shared group ownership for collaborative editing
+RUN groupadd -g 1111 kirbygroup && usermod -aG kirbygroup www-data
+
+# Provide Apache vhost configuration and entrypoint
+COPY default.conf /etc/apache2/sites-available/000-default.conf
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Remove default Apache placeholder page
+RUN rm -rf /var/www/html/*
+
+# Copy project into the image
+COPY --chown=www-data:kirbygroup . /var/www/html
+
+# Enable required Apache modules
+RUN a2enmod headers rewrite
+
+# Ensure collaborative permissions at runtime
+RUN chmod -R g+rw /var/www/html && find /var/www/html -type d -exec chmod g+xs {} \;
+
+# Expose web port
+EXPOSE 80
+
+# Allow UID remapping before Apache starts
+ENTRYPOINT ["/entrypoint.sh"]
+
+# Start Apache in foreground
+CMD ["/usr/sbin/apache2ctl", "-DFOREGROUND"]