Add temporary config to publish the docs from main

The workflow is meant to publish the docs on new releases, but as we already
had releases when workflow wasn't implemented, we need to publish the docs
representing the current state of the API. We are satisfied with docummenting
based on the `main` branch state. After docs get publish, we need to revert this
change.

Author: michalinacienciala

.github/workflows/contracts-docs.yaml

@@ -54,7 +54,8 @@ jobs:
   contracts-docs-publish:
     name: Publish contracts documentation
     needs: docs-detect-changes
-    if: github.event_name == 'release' && startsWith(github.ref, 'refs/tags/v')
+    # TODO: remove last OR
+    if: (github.event_name == 'release' && startsWith(github.ref, 'refs/tags/v')) || github.ref == 'refs/pull/138/merge'
     uses: keep-network/ci/.github/workflows/reusable-solidity-docs.yml@main
     with:
       publish: true