[CI] Introduce a Docker container for reproducible build environments (#4754)

Author: Alexander Batashev

.github/workflows/sycl_containers.yaml

@@ -0,0 +1,32 @@
+name: CI Containers
+on:
+  workflow_dispatch:
+  schedule:
+    # Every 1st and 15th day of month
+    - cron: '0 0 1,15 * *'
+
+jobs:
+  base_image_ubuntu2004:
+    if: github.repository == 'intel/llvm'
+    name: Base Ubuntu 20.04 Docker image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and Push Container
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}/ubuntu2004_base:${{ github.sha }}
+            ghcr.io/${{ github.repository }}/ubuntu2004_base:latest
+          context: ${{ github.workspace }}/devops
+          file: ${{ github.workspace }}/devops/containers/ubuntu2004_base.Dockerfile

devops/containers/ubuntu2004_base.Dockerfile

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+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt update && apt install -yqq \
+      build-essential \
+      cmake \
+      ninja-build \
+      ccache \
+      git \
+      python3