CI: Run main-docs pipeline only, when a docs PR is merged (#53026)

* Trigger docs pipeline on main, on docs only changes

* Export docs inclusion paths in variable

scripts/drone/events/main.star

@@ -9,6 +9,7 @@ load(
 load(
     'scripts/drone/pipelines/docs.star',
     'docs_pipelines',
+    'trigger_docs_main',
 )
 
 load(
@@ -48,6 +49,13 @@ ver_mode = 'main'
 trigger = {
     'event': ['push',],
     'branch': 'main',
+    'paths': {
+        'exclude': [
+            '*.md',
+            'docs/**',
+            'latest.json',
+        ],
+    },
 }
 
 def main_pipelines(edition):
@@ -68,7 +76,7 @@ def main_pipelines(edition):
     }
 
     pipelines = [
-        docs_pipelines(edition, ver_mode, trigger),
+        docs_pipelines(edition, ver_mode, trigger_docs_main()),
         test_frontend(trigger, ver_mode),
         test_backend(trigger, ver_mode),
         build_e2e(trigger, ver_mode, edition),

scripts/drone/events/pr.star

@@ -31,7 +31,7 @@ load(
 load(
     'scripts/drone/pipelines/docs.star',
     'docs_pipelines',
-    'trigger_docs',
+    'trigger_docs_pr',
 )
 
 ver_mode = 'pr'
@@ -56,7 +56,7 @@ def pr_pipelines(edition):
         test_backend(get_pr_trigger(include_paths=['pkg/**', 'packaging/**', '.drone.yml', 'conf/**', 'go.sum', 'go.mod', 'public/app/plugins/**/plugin.json']), ver_mode),
         build_e2e(trigger, ver_mode, edition),
         integration_tests(get_pr_trigger(include_paths=['pkg/**', 'packaging/**', '.drone.yml', 'conf/**', 'go.sum', 'go.mod', 'public/app/plugins/**/plugin.json']), ver_mode, edition),
-        docs_pipelines(edition, ver_mode, trigger_docs())
+        docs_pipelines(edition, ver_mode, trigger_docs_pr())
     ]
 
 

scripts/drone/pipelines/docs.star

@@ -26,6 +26,14 @@ load(
     'pipeline',
 )
 
+docs_paths = {
+    'include': [
+        '*.md',
+        'docs/**',
+        'packages/**',
+        'latest.json',
+    ],
+}
 
 def docs_pipelines(edition, ver_mode, trigger):
     steps = [
@@ -61,17 +69,19 @@ def lint_docs():
     }
 
 
-def trigger_docs():
+def trigger_docs_main():
+    return {
+        'branch': 'main',
+        'event': [
+            'push',
+        ],
+        'paths': docs_paths,
+    }
+
+def trigger_docs_pr():
     return {
         'event': [
             'pull_request',
         ],
-        'paths': {
-            'include': [
-                '*.md',
-                'docs/**',
-                'packages/**',
-                'latest.json',
-            ],
-        },
+        'paths': docs_paths,
     }