First release of dags. (#1)

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+### Bug description
+
+A clear and concise description of what the bug is.
+
+### To Reproduce
+
+Ideally, provide a minimal code example. If that's not possible, describe steps to reproduce the bug.
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+### Screenshots/Error messages
+
+If applicable, add screenshots to help explain your problem.
+
+### System
+
+ - OS: [e.g. Ubuntu 18.04]
+ - Version [e.g. 0.0.1]

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement
+about: Enhance an existing component.
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+* dags version used, if any:
+* Python version, if any:
+* Operating System:
+
+### What would you like to enhance and why? Is it related to an issue/problem?
+
+A clear and concise description of the current implementation and its limitations.
+
+### Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've
+considered and why you have discarded them.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature-request
+assignees: ''
+
+---
+
+### Current situation
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]; Currently there is no way of [...]
+
+### Desired Situation
+
+What functionality should become possible or easier?
+
+### Proposed implementation
+
+How would you implement the new feature? Did you consider alternative implementations?
+You can start by describing interface changes like a new argument or a new function. There is no need to get too detailed here.

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+### What problem do you want to solve?
+
+Reference the issue or discussion, if there is any. Provide a description of your
+proposed solution.
+
+### Todo
+
+- [ ] Target the right branch and pick an appropriate title.
+- [ ] Put `Closes #XXXX` in the first PR comment to auto-close the relevant issue once
+  the PR is accepted. This is not applicable if there is no corresponding issue.
+- [ ] Any steps that still need to be done.

.github/workflows/main.yml

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+name: main
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+    branches:
+    - '*'
+
+# Automatically cancel a previous run.
+concurrency:
+  group: ${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+
+  run-tests:
+
+    name: Run tests for ${{ matrix.os }} on ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install core dependencies.
+        shell: bash -l {0}
+        run: conda install -c conda-forge tox-conda
+
+      - name: Run pytest.
+        shell: bash -l {0}
+        run: tox -e pytest -- -m "not slow" --cov-report=xml --cov=./
+
+      - name: Upload coverage report.
+        if: runner.os == 'Linux' && matrix.python-version == '3.9'
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  docs:
+
+    name: Run documentation.
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          python-version: 3.9
+
+      - name: Install core dependencies.
+        shell: bash -l {0}
+        run: conda install -c conda-forge tox-conda
+
+      - name: Build docs
+        shell: bash -l {0}
+        run: tox -e sphinx

.github/workflows/publish-to-pypi.yml

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+name: PyPI
+
+on: push
+
+jobs:
+  build-n-publish:
+    name: Build and publish Python 🐍 distributions 📦 to PyPI
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.8
+
+    - name: Install pypa/build
+      run: >-
+        python -m
+        pip install
+        build
+        --user
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        build
+        --sdist
+        --wheel
+        --outdir dist/
+    - name: Publish distribution 📦 to PyPI
+      if: startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.PYPI_API_TOKEN }}

.gitignore

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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/
+pip-wheel-metadata/
+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/
+
+# 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
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.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
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__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/
+
+
+src/dags/_version.py