Fix docs workflow

Author: droserasprout

.github/workflows/docs.yml

@@ -51,7 +51,7 @@ jobs:
       run: MDBOOK_ROOT=https://dipdup.net/docs make docs
 
     - name: Deploy to GH Pages (docs)
-      if: startsWith(github.ref, 'refs/tags')
+      if: startsWith(github.ref, 'refs/tags') && !contains(github.ref, '-rc')
       uses: peaceiris/actions-gh-pages@v3
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
@@ -63,7 +63,7 @@ jobs:
       run: MDBOOK_ROOT=https://dipdup.net/docs-next make docs
 
     - name: Deploy to GH Pages (docs-next)
-      if: startsWith(github.ref, 'refs/heads')
+      if: startsWith(github.ref, 'refs/heads') || contains(github.ref, '-rc')
       uses: peaceiris/actions-gh-pages@v3
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}