Include pdf filenames into zuul config

Zuul jobs expect to know PDF filenames to be fetching from artifacts.
Best way is to include them into the project config while managing zuul
config.

tools/update_zuul_project_configs.py

@@ -130,6 +130,7 @@ def process_repositories(args, service):
         zuul_templates = None
         zuul_jobs = dict()
         zuul_new_jobs = list()
+        zuul_vars = dict()
         zuul_config_updated = False
         for item in zuul_config:
             if "project" in item.keys():
@@ -137,10 +138,11 @@ def process_repositories(args, service):
                 zuul_templates = project.setdefault("templates", [])
                 if not zuul_templates:
                     zuul_templates = []
+                zuul_vars = project.setdefault("vars", {})
             elif "job" in item.keys():
                 job = item["job"]
                 zuul_jobs[job["name"]] = job
-        print(f"Existing jobs {zuul_jobs}")
+        logging.debug(f"Existing jobs {zuul_jobs}")
         if "helpcenter-base-jobs" not in zuul_templates:
             zuul_templates.append("helpcenter-base-jobs")
             zuul_config_updated = True
@@ -148,6 +150,7 @@ def process_repositories(args, service):
         job_suffix = (
             "-hc-int-jobs" if args.environment == "internal" else "-hc-jobs"
         )
+        sphinx_pdf_files = zuul_vars.setdefault('sphinx_pdf_files', [])
         for doc in data.docs_by_service_type(service["service_type"]):
             logging.debug(f"Analyzing document {doc}")
             if not doc.get("type"):
@@ -156,6 +159,12 @@ def process_repositories(args, service):
                 doc_type = "dev-guide"
             else:
                 doc_type = doc["type"]
+            # Collect all PDF files into sphinx_pdf_files var
+            pdf_name = doc.get('pdf_name')
+            if pdf_name and f"{pdf_name}.pdf" not in sphinx_pdf_files:
+                sphinx_pdf_files.append(f"{pdf_name}.pdf")
+                zuul_config_updated = True
+
             template_name = f"{doc_type}{job_suffix}"
             if doc_type in ["api-ref", "umn", "dev-guide"]:
                 if template_name not in zuul_templates:
@@ -190,6 +199,7 @@ def process_repositories(args, service):
                 if "project" in item.keys():
                     project = item["project"]
                     project["templates"] = zuul_templates
+                    project["vars"] = zuul_vars
                     # Ensure new jobs are in check
                     if len(zuul_new_jobs) > 0:
                         project.setdefault(