Add in working cross-compiler container and builder script

Docker/Dockerfile.cross-compiler

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+ARG DOCKER_BASE_IMAGE=wolfssl/wolfssl-builder
+FROM $DOCKER_BASE_IMAGE
+
+USER root
+
+ARG DEPS_TESTING=gcc-arm-linux-gnueabi gcc-aarch64-linux-gnu
+RUN DEBIAN_FRONTEND=noninteractive apt update && apt install -y apt-utils \
+                    && apt install -y ${DEPS_TESTING} \
+                    && apt clean -y && rm -rf /var/lib/apt/lists/*
+
+ARG JENKINS_UID=1009
+ARG JENKINS_GID=1010
+RUN groupadd -f -g ${JENKINS_GID} jenkins && ( getent passwd ${JENKINS_UID} || useradd -ms /bin/bash jenkins -u ${JENKINS_UID} -g ${JENKINS_GID} )
+
+# Add github.com as an SSH known host
+RUN ssh -o StrictHostKeyChecking=no -T git@github.com; cat ~/.ssh/known_hosts >> /etc/ssh/ssh_known_hosts
+
+USER docker

Docker/buildAndPush.sh

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+#!/bin/bash
+
+DOCKER_BUILD_OPTIONS="$1"
+if [ "${DOCKER_BASE_IMAGE}" != "" ]; then
+    DOCKER_BUILD_OPTIONS+=" --build-arg DOCKER_BASE_IMAGE=${DOCKER_BASE_IMAGE}"
+fi
+
+CUR_DATE=$(date -u +%F)
+echo "Building wolfssl/wolfssl-builder:${CUR_DATE} as ${DOCKER_BUILD_OPTIONS}"
+docker build -t wolfssl/wolfssl-builder:${CUR_DATE} ${DOCKER_BUILD_OPTIONS} "${WOLFSSL_DIR}/Docker" && \
+    docker push wolfssl/wolfssl-builder:${CUR_DATE} && \
+    docker tag wolfssl/wolfssl-builder:${CUR_DATE} wolfssl/wolfssl-builder:latest && \
+    docker push wolfssl/wolfssl-builder:latest && \
+    docker build -t wolfssl/testing-cross-compiler:${CUR_DATE} "${WOLFSSL_DIR}/Docker" -f Dockerfile.cross-compiler && \
+    docker push wolfssl/testing-cross-compiler:${CUR_DATE} && \
+    docker tag wolfssl/testing-cross-compiler:${CUR_DATE} wolfssl/testing-cross-compiler:latest && \
+    docker push wolfssl/testing-cross-compiler:latest