feat: add Docker image creation

.dockerignore

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+__pycache__/
+.venv
+.envrc
+.env
+docker-compose.yml
+README.md
+dashboards

.github/workflows/container.yml

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+name: Container image build & push
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Build and push API image
+        uses: docker/build-push-action@v3
+        with:
+          file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64/v8
+          push: true
+          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/ctf-manager:latest

Dockerfile

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+FROM python:3.11-slim-bookworm
+WORKDIR /code
+COPY ./requirements.txt /code/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+COPY ./src /code/app
+COPY ./alembic /code/alembic
+COPY ./alembic.ini /code/alembic.ini
+EXPOSE 80
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"]