ci: fix conditions in publishing workflow

Publishing workflow will run building module API documentation for
opened or reopened pull request with label "full-ci" and will publish
documentation on Github Pages on push to the master branch.

NO_CHANGELOG=ci
NO_DOC=ci
NO_TEST=ci

.github/workflows/publish-module-api-doc.yaml

@@ -3,9 +3,17 @@ name: Publish module API documentation
 on:
   push:
     branches: [master]
+  pull_request:
+    types: [opened, reopened, synchronize, labeled]
+  workflow_dispatch:
 
 jobs:
   publish-api-doc:
+    # Run on push to the branch 'master' or on pull request if the 'full-ci'
+    # label is set.
+    if: github.repository == 'tarantool/tarantool' &&
+        ( github.event_name != 'pull_request' ||
+          contains(github.event.pull_request.labels.*.name, 'full-ci') )
     runs-on: ubuntu-latest
     steps:
       - uses: tarantool/actions/cleanup@master
@@ -28,6 +36,8 @@ jobs:
         uses: JamesIves/github-pages-deploy-action@v4.4.0
         with:
           folder: doc/
+        if: github.ref == 'refs/heads/master' &&
+            github.event_name != 'pull_request'
 
       - name: Send VK Teams message on failure
         if: failure()