Add cassandra images

software/cassandra/cassandra_java11_python3/Dockerfile

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+FROM        --platform=$BUILDPLATFORM adoptopenjdk/openjdk11:alpine-jre
+
+LABEL       author="Pascal Zarrad" maintainer="p.zarrad@outlook.de"
+
+LABEL       org.opencontainers.image.source="https://github.com/pterodactyl/yolks"
+LABEL       org.opencontainers.image.licenses=MIT
+
+RUN         apk add --update --no-cache python3 ca-certificates curl fontconfig git openssl sqlite tar tzdata \
+			    && adduser -D -h /home/container container
+
+USER        container
+ENV         USER=container HOME=/home/container
+WORKDIR     /home/container
+
+COPY        ./../entrypoint.sh /entrypoint.sh
+CMD         [ "/bin/ash", "/entrypoint.sh" ]

software/cassandra/cassandra_java8_python2/Dockerfile

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+FROM        --platform=$BUILDPLATFORM adoptopenjdk/openjdk8:alpine-jre
+
+LABEL       author="Pascal Zarrad" maintainer="p.zarrad@outlook.de"
+
+LABEL       org.opencontainers.image.source="https://github.com/pterodactyl/yolks"
+LABEL       org.opencontainers.image.licenses=MIT
+
+RUN         apk add --update --no-cache python2 ca-certificates curl fontconfig git openssl sqlite tar tzdata \
+			    && adduser -D -h /home/container container
+
+USER        container
+ENV         USER=container HOME=/home/container
+WORKDIR     /home/container
+
+COPY        ./../entrypoint.sh /entrypoint.sh
+CMD         [ "/bin/ash", "/entrypoint.sh" ]

software/cassandra/entrypoint.sh

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+#!/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 $NF;exit}')
+export INTERNAL_IP
+
+# Switch to the container's working directory
+cd /home/container || exit 1
+
+# Print Java version
+printf "\033[1m\033[33mcontainer@pterodactyl~ \033[0mjava -version\n"
+java -version
+
+# Print Python version
+printf "\033[1m\033[33mcontainer@pterodactyl~ \033[0mpython --version\n"
+python --version
+
+# Convert all of the "{{VARIABLE}}" parts of the command into the expected shell
+# variable format of "${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}