Add in files for yocto build environment

Docker/yocto/Dockerfile

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+FROM ubuntu
+
+# Set timezone to UTC
+RUN ln -snf /usr/share/zoneinfo/UTC /etc/localtime && echo UTC > /etc/timezone
+
+RUN DEBIAN_FRONTEND=noninteractive apt update && apt install -y gawk wget git diffstat unzip texinfo gcc build-essential chrpath socat cpio python3 python3-pip python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev python3-subunit mesa-common-dev zstd liblz4-tool file locales libacl1 vim && apt clean -y && rm -rf /var/lib/apt/lists/*
+RUN locale-gen en_US.UTF-8
+
+# Add in non-root user
+ENV UID_OF_DOCKERUSER 1000
+RUN useradd -m -s /bin/bash -g users -u ${UID_OF_DOCKERUSER} dockerUser
+RUN chown -R dockerUser:users /home/dockerUser && chown dockerUser:users /opt
+
+USER dockerUser
+
+RUN cd /opt && git clone git://git.yoctoproject.org/poky
+WORKDIR /opt/poky
+
+ARG YOCTO_VERSION=kirkstone
+RUN git checkout -t origin/${YOCTO_VERSION} -b ${YOCTO_VERSION} && git pull
+
+RUN /bin/bash -c "source oe-init-build-env && bitbake core-image-minimal"

Docker/yocto/buildAndPush.sh

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+#!/bin/bash
+
+# Assume we're in wolfssl/Docker/yocto
+WOLFSSL_DIR=$(builtin cd ${BASH_SOURCE%/*}/../..; pwd)
+
+DOCKER_BUILD_OPTIONS="$1"
+if [ "${DOCKER_BASE_IMAGE}" != "" ]; then
+    DOCKER_BUILD_OPTIONS+=" --build-arg DOCKER_BASE_IMAGE=${DOCKER_BASE_IMAGE}"
+fi
+
+NUM_FAILURES=0
+
+CUR_DATE=$(date -u +%F)
+for ver in kirkstone dunfell; do
+    echo "Building wolfssl/yocto:${ver}-${CUR_DATE} as ${DOCKER_BUILD_OPTIONS}"
+    docker build -t wolfssl/yocto:${ver}-${CUR_DATE} --build-arg YOCTO_VERSION=${ver} -f Dockerfile "${WOLFSSL_DIR}/Docker/yocto" && \
+        docker tag wolfssl/yocto:${ver}-${CUR_DATE} wolfssl/yocto:${ver}-latest
+    if [ $? -eq 0 ]; then
+        echo "Pushing containers to DockerHub"
+        docker push wolfssl/yocto:${ver}-${CUR_DATE} && docker push wolfssl/yocto:${ver}-latest
+    else
+        echo "Warning: Build wolfssl/yocto:${ver} failed. Continuing"
+        ((NUM_FAILURES++))
+    fi
+done
+
+echo "Script completed in $SECONDS seconds. Had $NUM_FAILURES failures."