Update top-level README.md, Basics lesson and add Teacher's Guide #9
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| name: Docker Image CI | |
| on: | |
| pull_request: | |
| branches: [ "master" ] | |
| workflow_dispatch: | |
| jobs: | |
| build: | |
| runs-on: ubuntu-latest | |
| steps: | |
| - uses: actions/checkout@v3 | |
| - name: Build the Codespaces container image | |
| run: docker build . --file .devcontainer/Dockerfile |