chore: add welcome workflow for new contributors (#2595)

* chore: add welcome workflow for new contributors

Signed-off-by: Aniket Patil <aniketpatil2027@gmail.com>

* chore: keep welcome workflow consistent

Signed-off-by: Aniket Patil <aniketpatil2027@gmail.com>

* chore: update welcome workflow links based on maintainer feedback

Signed-off-by: Aniket Patil <aniketpatil2027@gmail.com>

---------

Signed-off-by: Aniket Patil <aniketpatil2027@gmail.com>

Author: aniketpati1121

.github/workflows/welcome-new-contributors.yaml

@@ -0,0 +1,46 @@
+name: Welcome new contributors
+
+on:
+ pull_request_target:
+   types: [opened]
+ issues:
+   types: [opened]
+
+permissions:
+ contents: write
+ issues: write
+ pull-requests: write
+
+jobs:
+ welcome:
+   runs-on: ubuntu-latest
+   steps:
+     - uses: actions/first-interaction@v3
+       with:
+         repo_token: ${{ secrets.GITHUB_TOKEN }}
+
+         issue_message: |
+           🎉 **Welcome to the Kubeflow Katib repo!** 🎉
+
+           Thanks for opening your first issue! We're happy to have you as part of our community 🚀
+
+           **Next steps:**
+           - Our team will review your issue soon! cc @kubeflow/wg-automl-leads
+           - Check out the [Contributing Guide](https://github.com/kubeflow/katib/blob/master/CONTRIBUTING.md) and the [Kubeflow Contributor Guide](https://www.kubeflow.org/docs/about/contributing/)
+           - Join the Kubeflow Slack channels: https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels
+           - Join the AutoML & Training WG meetings: https://bit.ly/2PWVCkV
+
+           Feel free to ask questions in the comments. Thanks again for contributing! 🙏
+
+         pr_message: |
+           🎉 **Welcome to the Kubeflow Katib repo!** 🎉
+
+           Thanks for opening your first PR! We're excited to have you onboard 🚀
+
+           **Next steps:**
+           - Our team will review your PR soon! cc @kubeflow/wg-automl-leads
+           - Check out the [Contributing Guide](https://github.com/kubeflow/katib/blob/master/CONTRIBUTING.md) and the [Kubeflow Contributor Guide](https://www.kubeflow.org/docs/about/contributing/)
+           - Join the Kubeflow Slack channels: https://www.kubeflow.org/docs/about/community/#kubeflow-slack-channels
+           - Join the AutoML & Training WG meetings: https://bit.ly/2PWVCkV
+
+           Feel free to ask questions in the comments. Thanks again for contributing! 🙏