Add a base multi-arch container image build and GH Actions

.github/workflows/base_container_img.yml

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+name: Container Img Weekly Build and Release
+
+on:
+  schedule:
+    # This will run every week at 00:00 UTC on Monday
+    - cron: "0 0 * * 1"
+  workflow_dispatch:
+
+jobs:
+  build-and-push-docker-image:
+    name: Container Img Weekly Build and Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Get the current date
+        id: current_date
+        run: echo "name=$(date +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
+
+      - name: Build image and push to Docker Hub
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./infrastructure/base-container-img
+          platforms: linux/amd64,linux/arm64
+          tags: |
+            riscvintl/udb:${{ github.sha }}
+            riscvintl/udb:latest
+          push: ${{ github.event_name != 'pull_request' }}
+
+      - name: Set short SHA
+        run: echo "SHORT_SHA=${GITHUB_SHA::7}" >> "$GITHUB_ENV"
+
+      - name: Get current date
+        run: echo "CURRENT_DATE=$(date +'%Y-%m-%d')" >> "$GITHUB_ENV"

infrastructure/base-container-img

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+FROM ubuntu:24.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV DEVCONTAINER_ENV=1
+ENV BUNDLE_PATH=/usr/local/bundle
+ENV BUNDLE_APP_CONFIG=/usr/local/bundle
+
+# Set working directory
+WORKDIR /workspace
+
+# Install dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    git \
+    gh \
+    less \
+    python3 \
+    python3.12-venv \
+    python3-pip \
+    build-essential \
+    ruby \
+    ruby-dev \
+    bundler \
+    nodejs \
+    npm \
+    ditaa && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy and install Ruby dependencies
+COPY Gemfile Gemfile.lock ./
+RUN bundle install
+
+# Copy and install Node.js dependencies
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Final working directory
+WORKDIR /workspace