fix: improve CI workflow for Gitea compatibility and test detection

- Improve test file detection with more robust find command
  - Use explicit variable assignment instead of pipe to grep
  - Add debug output to show found test files
  - Handle errors gracefully with 2>/dev/null || true

- Downgrade actions for Gitea compatibility
  - upload-artifact@v4 -> v3 (Gitea doesn't support v4+)
  - codecov-action@v4 -> v3 (preventive downgrade)

- Add Alpine Linux build dependencies installation step
  - Install build-base and musl-dev when running on Alpine
  - Required for CGO-enabled builds and race detector

- Disable CGO for verify build step when no tests exist
  - Avoids requiring C build tools for simple compilation check

.github/workflows/ci.yml

@@ -36,11 +36,15 @@ jobs:
       - name: Check for test files
         id: check-tests
         run: |
-          if find . -name "*_test.go" -not -path "./vendor/*" -not -path "./.git/*" | grep -q .; then
+          echo "Checking for test files..."
+          TEST_FILES=$(find . -name "*_test.go" -not -path "./vendor/*" -not -path "./.git/*" 2>/dev/null || true)
+          if [ -n "$TEST_FILES" ]; then
+            echo "Found test files:"
+            echo "$TEST_FILES"
             echo "tests_exist=true" >> $GITHUB_OUTPUT
           else
-            echo "tests_exist=false" >> $GITHUB_OUTPUT
             echo "No test files found. Skipping test execution."
+            echo "tests_exist=false" >> $GITHUB_OUTPUT
           fi
 
       - name: Run tests
@@ -51,7 +55,7 @@ jobs:
 
       - name: Upload coverage
         if: steps.check-tests.outputs.tests_exist == 'true'
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v3
         with:
           file: ./coverage.out
           fail_ci_if_error: false
@@ -107,7 +111,7 @@ jobs:
         run: go build -v -o bin/platform ./cmd/platform
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: platform-binary
           path: bin/platform