Setting up github workflows for the project.

Signed-off-by: Cliff Hill <xlorep@darkhelm.org>

.github/CODEOWNERS

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+# CODEOWNERS file to enable PR review requirements (can be enabled in repo settings)
+# Uncomment the next line to require 2 reviewers for all code changes:
+# * @your-org/reviewers-team

.github/PULL_REQUEST_TEMPLATE.md

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+## Pull Request
+
+- [ ] This PR is from a feature branch (not main)
+- [ ] All Nox checks pass (CI will verify)
+- [ ] I have added/updated tests as needed
+- [ ] I have updated documentation as needed
+
+### Description
+
+<!-- Please describe your changes and link any related issues. -->
+
+### Checklist
+
+- [ ] Ready for review
+- [ ] Follows code style and guidelines

.github/workflows/docker-staging.yml

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+name: Build and Push Docker Images (Staging)
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push backend image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./backend
+          file: ./backend/Dockerfile
+          push: true
+          tags: ghcr.io/${{ github.repository }}/backend:staging
+      - name: Build and push frontend image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./frontend
+          file: ./frontend/Dockerfile
+          push: true
+          tags: ghcr.io/${{ github.repository }}/frontend:staging

.github/workflows/nox-ci.yml

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+name: Nox CI
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  nox:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libpq-dev
+      - name: Install pipx
+        run: python -m pip install --user pipx && python -m pipx ensurepath
+      - name: Install Nox
+        run: pipx install nox
+      - name: Install Poetry
+        run: pipx install poetry
+      - name: Install Yarn
+        run: npm install -g yarn
+      - name: Run Nox (all checks)
+        run: nox