ci: add a unit-test workflow

This is to  make sure unit tests are run and pass oneach PR.

Signed-off-by: Michael Adam <obnox@samba.org>

.github/workflows/unit-test.yaml

@@ -0,0 +1,31 @@
+name: Unit Tests
+on:
+  pull_request:
+    paths-ignore:
+      - 'vendor/*'
+    branches:
+      - main
+      - release-*
+
+# cancel the in-progress workflow when PR is refreshed.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+    unittests:
+      name: unittests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+        uses: actions/setup-go@v5
+        with: 
+          go-version-file: go.mod
+          check-latest: true
+      - name:  run unit tests
+        run:   make test