Make cassandra to a generic yolks image

cassandra/entrypoint.sh

@@ -0,0 +1,33 @@
+#!/bin/ash
+
+# Default the TZ environment variable to UTC.
+TZ=${TZ:-UTC}
+export TZ
+
+# Set environment variable that holds the Internal Docker IP
+INTERNAL_IP=$(ip route get 1 | awk '{print $NF;exit}')
+export INTERNAL_IP
+
+# Switch to the container's working directory
+cd /home/container || exit 1
+
+# Print Python version
+if command -v python &> /dev/null
+then
+	printf "\033[1m\033[33mcontainer@pterodactyl~ \033[0mpython --version\n"
+	python --version
+else
+	printf "\033[1m\033[33mcontainer@pterodactyl~ \033[0mpython3 --version\n"
+	python3 --version
+fi
+
+# Convert all of the "{{VARIABLE}}" parts of the command into the expected shell
+# variable format of "${VARIABLE}" before evaluating the string and automatically
+# replacing the values.
+PARSED=$(echo "${STARTUP}" | sed -e 's/{{/${/g' -e 's/}}/}/g' | eval echo "$(cat -)")
+
+# Display the command we're running in the output, and then execute it with the env
+# from the container itself.
+printf "\033[1m\033[33mcontainer@pterodactyl~ \033[0m%s\n" "$PARSED"
+# shellcheck disable=SC2086
+exec env ${PARSED}