Add workflows for build and test user code

This workflow is just a small example how the user code can be
built. In most cases this won't be enough since there is no
configuration for flags and bazel configs which users will
need to build their libraries and binaries.

Author: nradakovic

.github/workflows/build_and_test.yml

@@ -0,0 +1,47 @@
+# *******************************************************************************
+# Copyright (c) 2025 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+# Workflow configuration for `Bazel Build & Test`
+# This workflow runs Bazel build and test when triggered by specific pull request events.
+
+name: Bazel Build & Test
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+  merge_group:
+    types: [checks_requested]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+      - name: Setup Bazel
+        uses: bazel-contrib/[email protected]
+    # TODO: Uncomment this part once the code is ready for build
+    #       and define the target for it.
+    # - name: Bazel build module target(s)
+    #   run: |
+    #     bazel build <targets>
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+      - name: Setup Bazel
+        uses: bazel-contrib/[email protected]
+    # TODO: Uncomment this part once the code is ready for test
+    #       and define the targets for it.
+    # - name: Bazel test module target(s)
+    #   run: |
+    #     bazel test <targets>