added github actions workflow file to run sizing calculator unit tests

.github/workflows/sizing_calc_unit_tests.yml

@@ -0,0 +1,32 @@
+name: "sizing calculator unit tests"
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'yb-voyager/src/migassessment/**'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'yb-voyager/src/migassessment/**'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: '^1.20'
+
+      - name: Install dependencies
+        run: go mod tidy
+
+      - name: Run tests
+        run: go test ./... -v