refactor: clean up docker build for release channel

Dockerfile.release

@@ -0,0 +1,61 @@
+FROM ubuntu:22.04 as base
+
+RUN apt update && apt -y install \
+  software-properties-common \
+  apt-transport-https \
+  ca-certificates \
+  gnupg \
+  curl
+
+# Add Ondrej Sury's PPA for PHP
+RUN LC_ALL=C.UTF-8 add-apt-repository -y ppa:ondrej/php \
+  && apt update
+
+# Install PHP 8.1
+RUN DEBIAN_FRONTEND=noninteractive TZ=Etc/UTC apt -y install \
+  php8.1 \
+  php8.1-common \
+  php8.1-cli \
+  php8.1-gd \
+  php8.1-mysql \
+  php8.1-mbstring \
+  php8.1-bcmath \
+  php8.1-xml \
+  php8.1-fpm \
+  php8.1-curl \
+  php8.1-zip \
+  unzip \
+  tar \
+  git
+
+RUN rm -rf /var/lib/apt && \
+  rm -rf /var/lib/dpkg && \
+  rm -rf /var/lib/cache && \
+  rm -rf /var/lib/log
+
+FROM base as builder
+ARG PTERODACTYL_PANEL_VERSION="latest"
+
+WORKDIR /var/www/pterodactyl
+
+# Install composer
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+# Download the Pterodactyl Panel
+RUN curl -Lo panel.tar.gz https://github.com/pterodactyl/panel/releases/${PTERODACTYL_PANEL_VERSION}/download/panel.tar.gz
+RUN curl -Lo checksum.txt https://github.com/pterodactyl/panel/releases/${PTERODACTYL_PANEL_VERSION}/download/checksum.txt
+
+RUN sha256sum -c checksum.txt
+
+# Unpack the Pterodactyl Panel
+RUN tar -xzvf panel.tar.gz
+
+# Install dependencies
+RUN composer install --no-dev --optimize-autoloader
+
+FROM base as app
+
+WORKDIR /var/www/pterodactyl
+USER www-data
+
+COPY --from=builder --chown=www-data:www-data /var/www/pterodactyl /var/www/pterodactyl