Feat/coverage badge workflow

.coveragerc

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+[coverage:run]
+relative_files = true
+omit =
+    tests/*

.github/workflows/.cov.yml

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+name:
+  cov
+
+on:
+  push
+
+jobs:
+  cov-job:
+    runs-on: ubuntu-latest
+    name: checking coverage
+    permissions:
+      pull-requests: write
+      contents: write
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: set up python
+        id: setup-python
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3
+
+      - name: installing uv
+        run: pip install uv
+
+      - name: syncing uv
+        run: uv sync --all-extras
+
+      - name: activating uv venv
+        run: source .venv/bin/activate && coverage run -m pytest
+
+#      - name: launching coverage
+#        run: coverage run -m pytest
+
+      - name: cov_comment
+        id: coverage_comment
+        uses: py-cov-action/python-coverage-comment-action@v3
+        with:
+          GITHUB_TOKEN: ${{ github.token }}
+          MINIMUM_GREEN: 90
+
+      - name: Store Pull Request comment to be posted
+        uses: actions/upload-artifact@v4
+        if: steps.coverage_comment.outputs.COMMENT_FILE_WRITTEN == 'true'
+        with:
+          # If you use a different name, update COMMENT_ARTIFACT_NAME accordingly
+          name: python-coverage-comment-action
+          # If you use a different name, update COMMENT_FILENAME accordingly
+          path: python-coverage-comment-action.txt

README.md

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 # sqlmodelgen
 
+![Coverage badge](https://raw.githubusercontent.com/nucccc/sqlmodelgen/python-coverage-comment-action-data/badge.svg)
+
 `sqlmodelgen` is a library to generate models for the **sqlmodel** library ([repo](https://github.com/fastapi/sqlmodel), [official docs](https://sqlmodel.tiangolo.com/)).
 
 It accepts in input the following sources: