Attempt to add preview environments (#11734)

Just doing a quick test

.github/workflows/preview-env-dispatch.yaml

@@ -0,0 +1,34 @@
+name: 'Preview Environment Dispatch'
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  changed-files-check:
+    uses: ./.github/workflows/changed-files.yaml
+    with:
+      files: |
+        .github/workflows/preview-env-dispatch.yaml
+        .github/workflows/preview-env-keepalive.yaml
+        packages/twenty-docker/**
+        docker-compose.yml
+        packages/twenty-server/**
+        packages/twenty-front/**
+  
+  trigger-preview:
+    needs: changed-files-check
+    if: needs.changed-files-check.outputs.any_changed == 'true' || contains(github.event.pull_request.labels.*.name, 'preview')
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger preview environment workflow
+        uses: benc-uk/workflow-dispatch@v1
+        with:
+          workflow: preview-env-keepalive.yaml
+          token: ${{ secrets.GITHUB_TOKEN }}
+          inputs: '{"pr_number": "${{ github.event.pull_request.number }}", "pr_head_sha": "${{ github.event.pull_request.head.sha }}", "repo_full_name": "${{ github.repository }}"}'