ci: Add github build

Signed-off-by: Ryan Northey <ryan@synca.io>

Author: phlax

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+name: Build
+
+permissions:
+  contents: read
+
+on:
+  pull_request:
+  push:
+    branches:
+    - main
+
+concurrency:
+  group: >-
+    ${{ github.event.inputs.head_ref || github.run_id }}
+
+
+jobs:
+  build:
+    runs-on: ubuntu-24.04
+    if: github.repository_owner == 'envoyproxy'
+    steps:
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332  # v4.1.7
+    - run: |
+        ./build-repository.sh