Enable manual workflow dispatch for CI/CD build

Add workflow_dispatch trigger to allow manual execution of the CI/CD
workflow from the GitHub Actions UI. This enables developers to run
the workflow on-demand without requiring a push or pull request.

The workflow will now show a 'Run workflow' button in the GitHub
Actions interface while maintaining all existing automatic triggers.

Author: markpollack

.github/workflows/continuous-integration.yml

@@ -5,6 +5,7 @@ on:
     branches:
       - main
       - '*.*.x'
+  workflow_dispatch:
 
 jobs:
   build:
@@ -86,4 +87,3 @@ jobs:
           unzip spring-ai-$PROJECT_VERSION-docs.zip
           ssh -i $HOME/.ssh/key $DOCS_USERNAME@$DOCS_HOST "cd $DOCS_PATH && mkdir -p $PROJECT_VERSION"
           scp -i $HOME/.ssh/key -r api $DOCS_USERNAME@$DOCS_HOST:$DOCS_PATH/$PROJECT_VERSION
-