Add Gitea package publishing workflow

.gitea/workflows/publish.yml

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+name: Publish Package
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install build tools
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install build twine
+
+      - name: Build package
+        run: |
+          python -m build
+
+      - name: Check package
+        run: |
+          python -m twine check dist/*
+
+      - name: Publish to Gitea PyPI registry
+        env:
+          TWINE_USERNAME: ${{ secrets.GITEA_PACKAGE_USER }}
+          TWINE_PASSWORD: ${{ secrets.GITEA_PACKAGE_TOKEN }}
+        run: |
+          python -m twine upload \
+            --repository-url https://gitea.joseagrc.com/api/packages/tryton-do/pypi \
+            dist/*

doc/publishing.rst

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+Publishing
+==========
+
+Packages are published to the Gitea PyPI-compatible package registry when a
+version tag is pushed.
+
+Required repository secrets:
+
+* ``GITEA_PACKAGE_USER``
+* ``GITEA_PACKAGE_TOKEN``
+
+Publish a release:
+
+.. code-block:: console
+
+   git tag v8.0.0
+   git push origin v8.0.0
+
+Install from Gitea:
+
+.. code-block:: console
+
+   pip install \
+     --index-url https://gitea.joseagrc.com/api/packages/tryton-do/pypi/simple \
+     trytond_account_do