feat(docker): add basic docker support

.dockerignore

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+documentation
+.dockerignore
+Dockerfile
+.git
+.git*
+*.md
+
+# compiled output
+/dist
+/tmp
+/out-tsc
+# Only exists if Bazel was run
+/bazel-out
+
+# dependencies
+/node_modules
+
+# profiling files
+chrome-profiler-events.json
+speed-measure-plugin.json
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+.history/*
+
+# misc
+/.sass-cache
+/connect.lock
+/coverage
+/libpeerconnection.log
+npm-debug.log
+yarn-error.log
+testem.log
+/typings
+
+# System Files
+.DS_Store
+Thumbs.db
+
+# testing
+junit.xml

Dockerfile

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+### Stage 1: build client
+FROM node:18 as client-builder
+WORKDIR /client-builder
+
+# Install node packages
+COPY package.json .
+COPY client/package.json client/
+COPY client/package-lock.json client/
+RUN npm run install-dependencies:client
+
+# Build client
+COPY client/ client/
+RUN npm run build
+
+
+### Stage 2: final container
+FROM php:8.2-apache
+RUN apt-get update \
+    && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y cron unzip libjpeg62-turbo-dev libpng-dev libpq-dev libonig-dev libtidy-dev \
+    && update-ca-certificates --fresh \
+    && apt clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN docker-php-ext-configure gd \
+    && docker-php-ext-install gd mbstring pdo_pgsql pdo_mysql tidy
+
+RUN a2enmod headers rewrite
+
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
+    && php composer-setup.php \
+    && php -r "unlink('composer-setup.php');" \
+    && mv composer.phar /usr/local/bin/composer
+
+# Install dependencies
+COPY composer.json .
+COPY composer.lock .
+RUN COMPOSER_ALLOW_SUPERUSER=1 composer install --optimize-autoloader --no-dev
+
+# Setup cron
+RUN echo '* * * * * curl http://localhost/update' | tee /etc/cron.d/selfoss \
+    && chmod 0644 /etc/cron.d/selfoss \
+    && crontab /etc/cron.d/selfoss
+
+WORKDIR /var/www/html
+
+COPY . .
+
+COPY --from=client-builder /client-builder/public /var/www/html/public
+
+RUN chown -R www-data:www-data /var/www/html/data
+
+# Overload default command to run cron in the background
+RUN sed -i 's/^exec /service cron start\n\nexec /' /usr/local/bin/apache2-foreground
+
+VOLUME /var/www/html/data