fix(ci): declare integration_repo and integration_workflow for PullPreview dispatch

workflow_dispatch referenced these inputs for API dispatches but they were not
declared, leaving them empty and causing curl 404 on repos//actions/workflows//.

Add inputs with defaults (opf/integration-qa-helmfile, pullpreview-dispatch.yml)
and guard deploy/teardown when values are missing.

Made-with: Cursor

Author: Ihor-Khomenko

.github/workflows/e2e-pullpreview.yml

@@ -36,6 +36,16 @@ on:
         required: true
         default: main
         type: string
+      integration_repo:
+        description: "Repository that owns PullPreview deployment"
+        required: true
+        default: opf/integration-qa-helmfile
+        type: string
+      integration_workflow:
+        description: "Dispatchable workflow filename in integration repo"
+        required: true
+        default: pullpreview-dispatch.yml
+        type: string
       openproject_version:
         description: "OpenProject image tag"
         required: false
@@ -155,6 +165,11 @@ jobs:
           workflow_file="${{ github.event.inputs.integration_workflow }}"
           target_ref="${{ github.event.inputs.integration_ref }}"
 
+          if [ -z "${owner_repo}" ] || [ -z "${workflow_file}" ]; then
+            echo "::error::integration_repo and integration_workflow must be set."
+            exit 1
+          fi
+
           payload="$(jq -n \
             --arg ref "$target_ref" \
             --arg action "up" \
@@ -412,6 +427,11 @@ jobs:
           workflow_file="${{ github.event.inputs.integration_workflow }}"
           target_ref="${{ github.event.inputs.integration_ref }}"
 
+          if [ -z "${owner_repo}" ] || [ -z "${workflow_file}" ]; then
+            echo "::warning::integration_repo or integration_workflow empty; skipping teardown dispatch."
+            exit 0
+          fi
+
           payload="$(jq -n \
             --arg ref "$target_ref" \
             --arg action "down" \