[CI] First experiment at switching pre-commit back to pull_request trigger

The idea is to have an auxilliary workflow with `workflow_run` trigger
to control self-hosted AWS CUDA runner allocation/destruction.
Unfortunately, that trigger is taked from the default branch so I have
to make my experiments directly in our origin/sycl branch.

This PR provides the sketch for the workflow but doesn't enable the
actualy runner allocation (by not using 'aws-type' in the input
parameter) so that I can verify things simply by looking into the logs
without extra AWS activity.

Author: aelovikov-intel

.github/workflows/sycl_exp_precommit.yml

@@ -0,0 +1,18 @@
+name: SYCL Experimental Pre-Commit
+
+on:
+  pull_request:
+    branches:
+    - sycl
+
+jobs:
+  build:
+    runs-on: [Linux, build]
+    steps:
+      - run: echo "Build successful"
+
+  e2e:
+    needs: [build]
+    runs-on: aws_cuda-${{ github.run_id }}-${{ github.run_attempt }}
+    steps:
+      - run: echo "E2E on AWS CUDA successful"

.github/workflows/sycl_precommit_aws.yml

@@ -0,0 +1,33 @@
+name: Allocate/Shutdown AWS CUDA Runner
+
+on:
+  workflow_run:
+    workflows: [SYCL Experimental Pre-Commit]
+    types:
+      - in-progress
+      - completed
+
+jobs:
+  start-aws:
+    runs-on: ubuntu-20.04
+    environment: aws
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          sparse-checkout: devops/actions/aws-ec2
+      - run: npm install ./devops/actions/aws-ec2
+      - id: mode
+        run: |
+          if [ "${{ github.event.action }}" == "completed" ]; then
+              echo 'MODE=stop' >> $GITHUB_OUTPUT
+          else
+              echo 'MODE=start' >> $GITHUB_OUTPUT
+          fi
+      - uses: ./devops/actions/aws-ec2
+        with:
+          mode: ${{ steps.mode.outputs.MODE }}
+          runs-on-list: '[{"runs-on":"aws_cuda-${{ github.run_id }}-${{ github.run_attempt }}","aws-ami":"ami-01cb0573cb039ab24","aws-disk":"/dev/sda1:64","aws-spot":"false"}]'
+          # runs-on-list: '[{"runs-on":"aws_cuda-${{ github.run_id }}-${{ github.run_attempt }}","aws-ami":"ami-01cb0573cb039ab24","aws-type":["g5.2xlarge","g5.4xlarge"],"aws-disk":"/dev/sda1:64","aws-spot":"false"}]'
+          GH_PERSONAL_ACCESS_TOKEN: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
+          AWS_ACCESS_KEY: ${{ secrets.AWS_ACCESS_KEY }}
+          AWS_SECRET_KEY: ${{ secrets.AWS_SECRET_KEY }}