DB: Added initial DB testing docker-based script

dev/docker/db-testing/Dockerfile

@@ -0,0 +1,30 @@
+FROM ubuntu:24.04
+
+# Install additional dependencies
+RUN apt-get update && \
+    apt-get install -y \
+        git \
+		wget \
+        zip \
+        unzip \
+		php \
+		php-bcmath php-curl php-mbstring php-gd php-xml php-zip php-mysql php-ldap \
+       && \
+    rm -rf /var/lib/apt/lists/*
+
+# Take branch as an argument so we can choose which BookStack
+# branch to test against
+ARG BRANCH=development
+
+# Download BookStack & install PHP deps
+RUN mkdir -p /var/www && \
+    git clone https://github.com/bookstackapp/bookstack.git --branch "$BRANCH" --single-branch /var/www/bookstack && \
+    cd /var/www/bookstack && \	
+   wget https://raw.githubusercontent.com/composer/getcomposer.org/f3108f64b4e1c1ce6eb462b159956461592b3e3e/web/installer -O - -q | php -- --quiet --filename=composer && \
+    php composer install
+
+# Set the BookStack dir as the default working dir
+WORKDIR /var/www/bookstack
+
+# Set the default action as running php
+ENTRYPOINT ["/bin/php"]