gcloud.Dockerfile

# Dockerfile with gcloud
FROM ${BASE_AIRFLOW_IMAGE}

RUN RUN curl https://sdk.cloud.google.com | bash \
    && echo "source /home/airflow/google-cloud-sdk/path.bash.inc" >> /home/airflow/.bashrc \
    && echo "source /home/airflow/google-cloud-sdk/completion.bash.inc" >> /home/airflow/.bashrc
  

java.hadoop.Dockerfile

# Dockerfile with Java
FROM ${BASE_AIRFLOW_IMAGE}

USER 0

# Install Java
RUN mkdir -pv /usr/share/man/man1 \
    && mkdir -pv /usr/share/man/man7 \
    && curl -fsSL https://adoptopenjdk.jfrog.io/adoptopenjdk/api/gpg/key/public | apt-key add - \
    && echo 'deb https://adoptopenjdk.jfrog.io/adoptopenjdk/deb/ buster main' > \
        /etc/apt/sources.list.d/adoptopenjdk.list \
    && apt-get update \
    && apt-get install --no-install-recommends -y \
      adoptopenjdk-8-hotspot-jre \
    && apt-get autoremove -yqq --purge \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*
ENV JAVA_HOME=/usr/lib/jvm/adoptopenjdk-8-hotspot-jre-amd64

RUN mkdir -p /opt/spark/jars

# Install Hadoop
ARG HADOOP_VERSION=2.9.2
ENV HADOOP_HOME=/opt/hadoop-$HADOOP_VERSION

RUN HADOOP_URL="https://www.apache.org/dist/hadoop/common/hadoop-$HADOOP_VERSION/hadoop-$HADOOP_VERSION.tar.gz" \
    && set -x \
    && curl https://dist.apache.org/repos/dist/release/hadoop/common/KEYS | gpg --import KEYS \
    && curl -fSL "$HADOOP_URL" -o /tmp/hadoop.tar.gz \
    && curl -fSL "$HADOOP_URL.asc" -o /tmp/hadoop.tar.gz.asc \
    && gpg --verify /tmp/hadoop.tar.gz.asc \
    && tar -xvf /tmp/hadoop.tar.gz -C /opt/ \
    && rm /tmp/hadoop.tar.gz /tmp/hadoop.tar.gz.asc \
    && ln -s "${HADOOP_HOME}/etc/hadoop" /etc/hadoop \
    && mkdir "${HADOOP_HOME}/logs" \
    && mkdir /hadoop-data

ENV HADOOP_CONF_DIR=/etc/hadoop
ENV MULTIHOMED_NETWORK=1
ENV USER=root
ENV PATH=$HADOOP_HOME/bin/:$PATH

# Install GCS connector for staging jars in GCS
ARG GCS_VARIANT="hadoop2"
ARG GCS_VERSION="2.1.5"

RUN GCS_JAR_PATH="/opt/spark/jars/gcs-connector-${GCS_VARIANT}-${GCS_VERSION}.jar" \
    && GCS_JAR_URL="https://storage.googleapis.com/hadoop-lib/gcs/gcs-connector-${GCS_VARIANT}-${GCS_VERSION}.jar" \
    && curl "${GCS_JAR_URL}" -o "${GCS_JAR_PATH}"

ENV HADOOP_CLASSPATH="/opt/spark/jars/gcs-connector-${GCS_VARIANT}-${GCS_VERSION}.jar:$HADOOP_CLASSPATH"

USER ${AIRFLOW_UID}

kubectl.Dockerfile

FROM ${BASE_AIRFLOW_IMAGE}

USER 0

RUN KUBECTL_VERSIPN="$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)" \
    && KUBECTL_URL="https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSIPN}/bin/linux/amd64/kubectl" \
    && curl -L "${KUBECTL_URL}" --output /usr/local/bin/kubectl \
    && chmod +x /usr/local/bin/kubectl

USER ${AIRFLOW_UID}

More inspiration:
https://github.com/apache/airflow/blob/738667082d32d3ef93ec2cd6c3735ff3691ba1cc/Dockerfile.ci#L157