Add workflow to release hybridsim nightly.

.github/workflows/nightly_release_utils/build_and_upload_images.sh

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+#!/bin/bash
+
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This script builds and uploads two images - one with only dependencies, the other also has a code snapshot.
+# These images are tagged in GCR with both "latest" and date in format YYYY-MM-DD via $(date +%Y-%m-%d)
+
+# Example command:
+# bash build_and_upload_images.sh PROJECT=<project> MODE=nightly MERGE_IMAGE_NAME=<MERGE_IMAGE_NAME> OUTPUT_IMAGE_NAME=<OUTPUT_IMAGE_NAME>
+
+
+# Set environment variables
+for ARGUMENT in "$@"; do
+    IFS='=' read -r KEY VALUE <<< "$ARGUMENT"
+    export "$KEY"="$VALUE"
+    echo "$KEY"="$VALUE"
+done
+
+if [[ ! -v OUTPUT_IMAGE_NAME ]] || [[ ! -v PROJECT ]] || [[ ! -v MODE ]] || [[ ! -v MERGE_IMAGE_NAME ]]; then
+  echo "You must set OUTPUT_IMAGE_NAME, PROJECT, MODE, and MERGE_IMAGE_NAME"
+  exit 1
+fi
+
+gcloud auth configure-docker --quiet
+image_date=$(date +%Y-%m-%d)
+
+merge_image=gcr.io/$PROJECT/$MERGE_IMAGE_NAME:latest
+output_image=gcr.io/$PROJECT/$OUTPUT_IMAGE_NAME:$image_date
+
+docker pull $merge_image
+docker build --build-arg MERGE_IMAGE=$merge_image -f .github/workflows/nightly_release_utils/merge.Dockerfile -t ${OUTPUT_IMAGE_NAME}_runner .
+docker tag ${OUTPUT_IMAGE_NAME}_runner $output_image
+docker push $output_image

.github/workflows/nightly_release_utils/merge.Dockerfile

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+ARG MERGE_IMAGE
+FROM $MERGE_IMAGE AS merge
+
+# Use Python 3.10 as the base image
+FROM python:3.10-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y curl gnupg
+
+# Add the Google Cloud SDK package repository
+RUN echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
+RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key --keyring /usr/share/keyrings/cloud.google.gpg add -
+
+# Install the Google Cloud SDK
+RUN apt-get update && apt-get install -y google-cloud-sdk
+
+# Set the default Python version to 3.10
+RUN update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.10 1
+
+# Set environment variables for Google Cloud SDK and Python 3.10
+ENV PATH="/usr/local/google-cloud-sdk/bin:/usr/local/bin/python3.10:$PATH"
+
+# Copy everything from the merge image
+COPY --from=merge / /
+
+WORKDIR /app

.github/workflows/upload-docker-images.yml

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+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Build Images
+
+on:
+  push:
+      branches:
+        - docker-nightly-release
+  schedule:
+    # Run the job daily at 12AM UTC (5AM PT)
+    - cron:  '0 0 * * *'
+
+jobs:
+  tpu:
+    strategy:
+      fail-fast: false
+      matrix:
+        device-type: ["v4-8"]
+    runs-on: ["self-hosted", "tpu", "${{ matrix.device-type }}"]
+    steps:
+    - uses: actions/checkout@v3
+    - name: build hybridsim nightly image
+      run : |
+        bash .github/workflows/nightly_release_utils/build_and_upload_images.sh PROJECT=tpu-prod-env-multipod MODE=nightly MERGE_IMAGE_NAME=hybridsim_nightly MERGE_IMAGE_NAME=hybridsim_nightly
+