Add Dockerfile for notifications job and Github action workflow

.github/workflows/gcp_notifications_job.yml

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+name: Deploy Notifications Job to Cloud RUN
+
+on:
+  push:
+    branches: [ "migrate-noti-job-to-gcp" ]
+    paths:
+      - '**/*'
+  workflow_dispatch:
+    inputs:
+      environment:
+        description: 'Select the environment to deploy to'
+        required: true
+        default: 'development'
+      branch:
+        description: 'Branch to deploy from'
+        required: true
+        default: 'main'
+
+env:
+  SERVICE: notifications-job
+  REGION: us-central1
+
+jobs:
+  deploy:
+    # environment: ${{ github.event.inputs.environment }}
+    environment: development
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+
+    runs-on: ubuntu-latest
+    steps:
+      # - name: Validate Environment Input
+      #   run: |
+      #     if [[ "${{ github.event.inputs.environment }}" != "development" && "${{ github.event.inputs.environment }}" != "prod" ]]; then
+      #       echo "Invalid environment: ${{ github.event.inputs.environment }}. Must be 'development' or 'prod'."
+      #       exit 1
+      #     fi
+
+      # To workaround "no space left on device" issue of GitHub-hosted runner
+      - name: Delete huge unnecessary tools folder
+        run: rm -rf /opt/hostedtoolcache
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Google Auth
+        id: auth
+        uses: 'google-github-actions/auth@v2'
+        with:
+          credentials_json: ${{ secrets.GCP_CREDENTIALS }}
+
+      - name: Login to GCR
+        run: gcloud auth configure-docker
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Google Service Account
+        run: echo "${{ secrets.GCP_SERVICE_ACCOUNT }}" | base64 -d > ./backend/google-credentials.json
+
+      - name: Build and Push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./backend/modal/Dockerfile.notifications_job
+          push: true
+          tags: gcr.io/${{ vars.GCP_PROJECT_ID }}/${{ env.SERVICE }}:latest
+          cache-from: type=registry,ref=gcr.io/${{ vars.GCP_PROJECT_ID }}/${{ env.SERVICE }}:buildcache
+          cache-to: type=registry,ref=gcr.io/${{ vars.GCP_PROJECT_ID }}/${{ env.SERVICE }}:buildcache,mode=max
+
+      - name: Deploy to Cloud Run
+        id: deploy
+        uses: google-github-actions/deploy-cloudrun@v2
+        with:
+          job: ${{ env.SERVICE }}
+          region: ${{ env.REGION }}
+          image: gcr.io/${{ vars.GCP_PROJECT_ID }}/${{ env.SERVICE }}
+
+      # If required, use the Cloud Run url output in later steps
+      - name: Show Output
+        run: echo ${{ steps.deploy.outputs.url }}

backend/modal/Dockerfile.notifications_job

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+FROM python:3.11 AS builder
+
+ENV PATH="/opt/venv/bin:$PATH"
+RUN python -m venv /opt/venv
+
+COPY backend/requirements.txt /tmp/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /tmp/requirements.txt
+
+FROM python:3.11-slim
+
+WORKDIR /app
+ENV PATH="/opt/venv/bin:$PATH"
+
+RUN apt-get update && apt-get -y install ffmpeg curl unzip && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /opt/venv /opt/venv
+COPY backend/ .
+COPY backend/modal/ .
+
+CMD ["python", "job_modal.py"]