feat(hub): Init hub apps directory & dev tools

[yan-gao-GY]

Issue

Description

When apps in the examples repository are updated (for example, during each flwr release), the corresponding apps on the Flower Hub under the flwrlabs account must also be updated to stay in sync.

Proposal

Create symlinks in hub/apps/ pointing to the examples that are already published on the Hub.

Add helper scripts under hub/dev/:

• bump_app_versions.py: Used to bump the app versions for Flower Hub apps.
• publish_apps.sh: Used to publish updated apps to the Hub.

[Copilot]

Pull request overview

Initializes hub/apps/ to track Flower Hub apps via symlinks to the examples/ repository and adds developer tooling to bump versions and publish apps to the Hub.

Changes:

• Added hub/dev/publish_apps.sh to publish one/all hub apps via flwr app publish.
• Added hub/dev/bump_app_versions.py to bump project.version in app pyproject.toml files.
• Added many hub/apps/* entries intended as symlinks to corresponding examples/* apps.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
hub/dev/publish_apps.sh	Adds a CLI helper to publish selected/all Hub apps via flwr.
hub/dev/bump_app_versions.py	Adds a helper to bump project.version in app pyproject.toml files.
hub/apps/supernode-authentication	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-xgboost	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-tensorflow	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-sklearn	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-pytorch-lightning	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-pytorch	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-pennylane	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-pandas	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-numpy	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-monai	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-mlx	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-jax	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-huggingface	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-fastai	Adds a link to the corresponding examples/ app.
hub/apps/quickstart-catboost	Adds a link to the corresponding examples/ app.
hub/apps/opacus	Adds a link to the corresponding examples/ app.
hub/apps/flowertune-llm-medical	Adds a link to the corresponding examples/ app.
hub/apps/flowertune-llm-general-nlp	Adds a link to the corresponding examples/ app.
hub/apps/flowertune-llm-finance	Adds a link to the corresponding examples/ app.
hub/apps/flowertune-llm-code	Adds a link to the corresponding examples/ app.
hub/apps/flower-secure-aggregation	Adds a link to the corresponding examples/ app.
hub/apps/fl-tabular	Adds a link to the corresponding examples/ app.
hub/apps/fl-dp-sa	Adds a link to the corresponding examples/ app.
hub/apps/custom-mods	Adds a link to the corresponding examples/ app.

Comments suppressed due to low confidence (1)

hub/apps/quickstart-xgboost:1

• These hub/apps/* link targets are absolute paths on a specific machine. That will break for other developers/CI and also leaks local filesystem details into the repo. If these entries are meant to be symlinks, they should point to a repo-relative location (e.g., ../../examples/<app> from within hub/apps/) so the links resolve anywhere the repo is checked out. (Same issue appears to apply to the other newly added hub/apps/* entries in this PR.)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.