first commit

.github/workflows/main.yml

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+name: Build Py Hello World
+
+on:
+  push:
+    branches: [ main ]
+
+permissions: read-all
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  IMAGE_REGISTRY: docker.io
+  IMAGE_NAME: ${{ github.event.repository.name }}-py-hello-world
+  REGISTRY_USERNAME: upgradkrithikavenugopal
+
+jobs:
+  build:
+    outputs:
+      image: ${{ steps.image.outputs.image }}
+      digest: ${{ steps.build.outputs.digest }}
+    permissions:
+      packages: write # for uploading attestations.
+      contents: read
+      id-token: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v2.3.4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6 # v2.0.0
+
+      - name: Authenticate Docker
+        # uses: docker/login-action@49ed152c8eca782a232dede0303416e8f356c37b # v2.0.0
+        uses: docker/login-action@v3
+        with:
+          # Use docker to simpliy local testing.
+          registry: ${{ env.IMAGE_REGISTRY }}
+          username: upgradkrithikavenugopal
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@69f6fc9d46f2f8bf0d5491e4aabe0bb8c6a4678a # v4.0.1
+        with:
+          images: ${{ env.IMAGE_REGISTRY }}/${{ env.REGISTRY_USERNAME }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@e551b19e49efd4e98792db7592c17c09b89db8d8 # v3.0.0
+        id: build
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          context: "{{defaultContext}}:images/py-hello-world"
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Install Cosign
+        uses: sigstore/cosign-installer@dc72c7d5c4d10cd6bcb8cf6e3fd625a9e5e537da # v3.7.0
+
+      - shell: bash
+        run: |
+          set -e
+          cosign sign --yes \
+            -a "repo=${{ github.repository }}" \
+            -a "workflow=${{ github.workflow }}" \
+            -a "ref=${{ github.sha }}" \
+            ${IMAGE_REGISTRY}/${REGISTRY_USERNAME}/${IMAGE_NAME}@${{ steps.build.outputs.digest }}
+
+      - name: Output image
+        id: image
+        run: |
+          image_name="${IMAGE_REGISTRY}/${REGISTRY_USERNAME}/${IMAGE_NAME}"
+          echo "image=$image_name" >> "$GITHUB_OUTPUT"
+
+  provenance:
+    needs: [build]
+    permissions:
+      actions: read # for detecting the Github Actions environment.
+      id-token: write # for creating OIDC tokens for signing.
+      packages: write # for uploading attestations.
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.10.0
+    with:
+      image: ${{ needs.build.outputs.image }}
+      digest: ${{ needs.build.outputs.digest }}
+      # Use name rather than env variable because env are not available for reusable workflows.
+      registry-username: upgradkrithikavenugopal
+    secrets:
+      registry-password: ${{ secrets.REGISTRY_PASSWORD }}
+
+  run:
+    needs: [build, provenance]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Authenticate Docker
+        uses: docker/login-action@49ed152c8eca782a232dede0303416e8f356c37b # v2.0.0
+        with:
+        # Use docker to simpliy local testing.
+          registry: ${{ env.IMAGE_REGISTRY }}
+          username: ${{ env.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Run it
+        env:
+          IMAGE: ${{ needs.build.outputs.image }}
+          DIGEST: ${{ needs.build.outputs.digest }}
+        run: |
+          docker pull "${IMAGE}@${DIGEST}"
+
+          # See https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions for log types.
+          echo "::warning ${IMAGE}@${DIGEST}"

gitignore.txt

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/

images/py-hello-world/Dockerfile.txt

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+# Dockerfile
+FROM python:3.9
+
+WORKDIR /app
+
+COPY requirements.txt requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 5000
+
+CMD ["flask", "run", "--host=0.0.0.0"]

images/py-hello-world/app.py

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+from flask import Flask
+
+app = Flask(__name__)
+app.config['TESTING'] = True 
+
+@app.route("/")
+def hello_world():
+    return "<p>Hello, World!</p>"
+
+if __name__ == "__main__":
+    app.run(debug=True)

images/py-hello-world/requirements.txt

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+Flask==3.0.0