Update VSTS agent version to 4.251.0 and add CI workflow for automated builds

Author: btungut

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+on:
+  push:
+    paths-ignore:
+      - "README.md"
+      - "LICENSE"
+  pull_request:
+
+env:
+  DOCKER_BUILDKIT: 1
+  DOCKER_REPO_TAG: "${{ github.repository }}:${{ github.sha }}"
+
+jobs:
+
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: docker build
+      uses: docker/build-push-action@v4
+      with:
+        context: src
+        file: ./Dockerfile
+        push: false
+        tags: ${{ env.DOCKER_REPO_TAG }}

Dockerfile

@@ -3,7 +3,7 @@ ARG ARG_UBUNTU_BASE_IMAGE_TAG="20.04"
 FROM ubuntu:${ARG_UBUNTU_BASE_IMAGE_TAG}
 WORKDIR /azp
 ENV TARGETARCH=linux-x64
-ENV VSTS_AGENT_VERSION=3.248.0
+ENV VSTS_AGENT_VERSION=4.251.0
 
 
 # To make it easier for build and release pipelines to run apt-get,