Add a smoke test

.fmf/version

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+1

plan.fmf

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+discover:
+  how: fmf
+execute:
+  how: tmt
+

tests/smoke/main.fmf

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+summary: run the basic documentation build
+test: |
+    sphinx-build -M html source/ build/ &&
+    grep '<section id="test-docfile">' build/html/index.html &&
+    grep '<h1>Test docfile' build/html/index.html &&
+    rm -rf build/
+require:
+  - python3-sphinx
+  - python3-sphinx-theme-alabaster

tests/smoke/source/conf.py

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+project = 'Test'
+copyright = '2024, Test'
+author = 'Test'
+release = '0.3.0'
+html_theme = 'alabaster'

tests/smoke/source/index.rst

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+Test docfile
+============
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`