Adding workflow to build the extension on push and pull request.

.github/workflows/main.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# This file has been modified for Oracle Java SE extension
+
+name: Java Platform Support for Visual Studio Code
+
+on:
+  push:
+  pull_request:
+    # unlocked event is used as super secret restart button
+    types: [opened, synchronize, unlocked]
+
+# cancel other PR workflow run in the same head-base group if it exists (e.g. during PR syncs)
+# if this is not a PR run (no github.head_ref and github.base_ref defined), use an UID as group
+concurrency:
+  group: ${{ github.head_ref || github.run_id }}-${{ github.base_ref }}
+  cancel-in-progress: true
+
+jobs:
+
+  # primary build job, most other jobs use the artifact produced here
+  # artifact is only produced once in the matrix
+  base-build:
+    name: Base Build
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    strategy:
+      matrix:
+        java: [ '17' ]
+      fail-fast: false
+    steps:
+
+      - name: Set up JDK ${{ matrix.java }}
+        uses: oracle-actions/setup-java@v1
+        with:
+          release: ${{ matrix.java }}
+
+      - name: Checkout ${{ github.ref }} ( ${{ github.sha }} )
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+          submodules: false
+
+      - name: Checkout NetBeans
+        uses: actions/checkout@v4
+        with:
+          repository: apache/netbeans
+          path: netbeans
+          ref: f48f91e6c197d8a40bd82fc2f2d12a4e71242afe
+
+      - name: Apply NetBeans patches
+        run: ant apply-patches
+
+      - name: Build NetBeans
+        run: ant build-netbeans
+
+      - name: Build the Visual Studio Extension
+        run: ant build-vscode-ext