Add coverage export workflow

Author: oxy-rostyslav

.github/workflows/deploy-badge.yml

@@ -0,0 +1,56 @@
+name: Export Coverage Data
+
+on:
+  workflow_run:
+    # IMPORTANT: Replace "Run Tests and Upload Coverage" with the EXACT name
+    # of your workflow file (e.g., ci.yml) or the 'name:' attribute defined in that workflow file.
+    workflows: ["Lint & Test"]
+    types:
+      - completed
+#    branches: # Only run for completions on these branches of the source workflow
+#      - update-readme # Or your primary development branch
+
+jobs:
+  export-coverage:
+    runs-on: ubuntu-latest
+    # Only run this job if the triggering workflow (Producer) was successful
+    # if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        # This checkout is to get the peaceiris/actions-gh-pages action and context,
+        # the actual coverage file will be downloaded as an artifact.
+
+      - name: Download badge
+        uses: actions/download-artifact@v4
+        with:
+          # This name MUST match the 'name' provided to 'actions/upload-artifact'
+          # in your Producer Workflow.
+          name: coverage-badge
+          # The artifact is downloaded from the workflow run that triggered this workflow.
+          # 'actions/download-artifact' will download it to the root of the workspace
+          # if the uploaded artifact was a single file.
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          run_id: ${{ github.event.workflow_run.id }}
+
+      # After download, the artifact (e.g., coverage.xml or coverage.json)
+      # should be in the root of your workspace.
+      # Verify the filename matches what you expect (e.g., coverage.xml or coverage.json).
+
+      - name: Deploy coverage report to branch
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_branch: coverage # Branch to push the coverage file to
+          # This directory should contain the downloaded artifact.
+          # If 'actions/download-artifact' places 'coverage.xml' at the root, '.' is correct.
+          publish_dir: .
+          # IMPORTANT: This MUST be the actual filename of your coverage report
+          # as it exists after being downloaded by 'actions/download-artifact'.
+          # e.g., coverage.xml or coverage.json
+          keep_files: coverage-badge.svg # Or coverage.json
+          user_name: 'github-actions[bot]'
+          user_email: 'github-actions[bot]@users.noreply.github.com'
+          commit_message: 'chore: Update coverage data from workflow run ${{ github.event.workflow_run.id }}'
+          # force_orphan: true # Optional: Create a completely new branch without history
+          # allow_empty_commit: false # Default is false, change if needed