senzing-garage/sz-sdk-go#125 add go coverage (#137)

* senzing-garage/sz-sdk-go#125 add go coverage

* update permissions

.github/workflows/go-coverage.yaml

@@ -0,0 +1,26 @@
+name: go coverage
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  go-coverage:
+    name: go coverage
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/download-artifact@v4
+        id: download
+        with:
+          pattern: cover.out
+          merge-multiple: true
+
+      - name: check test coverage
+        uses: vladopajic/go-test-coverage@v2
+        with:
+          config: ./.testcoverage.yml