fix(#1): Fix publish step - check simple index for existing version

Gitea PyPI registry does not support twine --skip-existing. Instead,
curl the simple index page and grep for the version in filenames before
attempting upload. Uses underscore naming (mosaicstack_telemetry) to
match actual sdist/wheel filenames.

Refs #1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker.yml

@@ -70,14 +70,19 @@ steps:
         CURRENT=$$(uv run python3 -c "import tomllib; print(tomllib.load(open('pyproject.toml','rb'))['project']['version'])")
         echo "Building version $$CURRENT..."
         uv build
-        echo "Publishing $$CURRENT..."
-        uv run twine upload \
-          --repository-url "https://git.mosaicstack.dev/api/packages/mosaic/pypi" \
-          --username "$$GITEA_USER" \
-          --password "$$GITEA_TOKEN" \
-          --skip-existing \
-          dist/*
-        echo "Published mosaicstack-telemetry $$CURRENT"
+        echo "Checking if $$CURRENT is already published..."
+        INDEX_PAGE=$$(curl -sf "https://git.mosaicstack.dev/api/packages/mosaic/pypi/simple/mosaicstack-telemetry/" 2>/dev/null || echo "")
+        if echo "$$INDEX_PAGE" | grep -q "mosaicstack_telemetry-$$CURRENT"; then
+          echo "Version $$CURRENT already published, skipping upload"
+        else
+          echo "Publishing $$CURRENT..."
+          uv run twine upload \
+            --repository-url "https://git.mosaicstack.dev/api/packages/mosaic/pypi" \
+            --username "$$GITEA_USER" \
+            --password "$$GITEA_TOKEN" \
+            dist/*
+          echo "Published mosaicstack-telemetry $$CURRENT"
+        fi
     when:
       - branch: [main, develop]
         event: [push, manual, tag]