Create trigger_clean_build.yml (#1988)

Signed-off-by: Ashley Canning <[email protected]>

.github/workflows/trigger_clean_build.yml

@@ -0,0 +1,39 @@
+name: Trigger Clean Build
+
+on:
+  workflow_dispatch:
+    inputs:
+      pr_number:
+        description: 'Pull Request number to build'
+        required: true
+        type: number
+
+jobs:
+  trigger_clean_build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get PR branch
+        id: get_branch
+        run: |
+          PR_DATA=$(curl -s -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+                    "https://api.github.com/repos/${{ github.repository }}/pulls/${{ github.event.inputs.pr_number }}")
+          PR_BRANCH=$(echo $PR_DATA | jq -r .head.ref)
+          echo "pr_branch=${PR_branch}" >> $GITHUB_OUTPUT
+
+      - name: Trigger Unity Cloud Build workflow
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            github.rest.actions.createWorkflowDispatch({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: 'unity_cloud_build.yml',
+              ref: '${{ steps.get_branch.outputs.pr_branch }}',
+              inputs: {
+                clean_build: 'true'
+              }
+            })