Adds python multi-file with excel example

[merschformann]

Description

Adds an example app that uses the new multi-file format with Excel files as the I/O.

Changes

• Adds python-ortools-multiknapsack-multiexcel showcasing use of multi-file format with Excel (.xlsx) files.
• Fixes item integrity in java-gurobi-multiknapsack-multiexcel.
• Fixes paths in java-gurobi-multiknapsack-multiexcel.
• Bumps all nextmv and nextpipe Python dependencies to their latest version.

Resolves ENG-6240

[Copilot]

Pull Request Overview

An example application demonstrating how to use the Nextmv multi-file format with Excel I/O to solve a multi-knapsack problem using OR-Tools.

• Adds a self-contained Python example app with Excel input/output and Nextmv multi-file loading.
• Implements a decision model that reads “items” and “knapsacks” from separate sheets, solves the MIP, and writes assignments to Excel/CSV.
• Includes configuration (app.yaml), installation/workflow scripts, README, and licensing.

Reviewed Changes

Copilot reviewed 10 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
python-ortools-multiknapsack-multiexcel/requirements.txt	Pins nextmv and ortools dependencies
python-ortools-multiknapsack-multiexcel/outputs/.keep	Placeholder to ensure outputs/ directory exists
python-ortools-multiknapsack-multiexcel/main.py	Core solver example using multi-file Excel I/O
python-ortools-multiknapsack-multiexcel/app.yaml	Nextmv Cloud runtime manifest
python-ortools-multiknapsack-multiexcel/README.md	Usage instructions and links
python-ortools-multiknapsack-multiexcel/LICENSE	Apache 2.0 license text
.nextmv/readme/workflow-configuration.yml	Adds CI workflow entry for the new example app
.nextmv/readme/python-ortools-multiknapsack-multiexcel/1.sh.golden	Golden output for the example run
.nextmv/readme/python-ortools-multiknapsack-multiexcel/1.sh	Example run command
.nextmv/readme/python-ortools-multiknapsack-multiexcel/0.sh	Install dependencies script

Comments suppressed due to low confidence (3)

python-ortools-multiknapsack-multiexcel/main.py:29

• [nitpick] The variable name input shadows the built-in input() function; consider renaming to input_data or similar to avoid confusion.

    input = nextmv.load(

python-ortools-multiknapsack-multiexcel/README.md:13

• [nitpick] The second step is also numbered 1.; updating it to 2. would improve clarity of the instructions.

1. Run the app.

python-ortools-multiknapsack-multiexcel/README.md:3

• [nitpick] It would be helpful to include a note or sample template for input.xlsx describing required sheet names (items, knapsacks) and column format so users know how to prepare their Excel file.

Example for running a Python application on the Nextmv Platform using the

[sebastian-quintero]

Left some nits, and the nextmv version can be set now!

[sebastian-quintero]

Nit: call this multi-file as opposed to multiexcel to better reflect the actual file type handled by Nextmv.

[merschformann]

Yeah, I thought the same, but we used multicsv in the repo before, so, I wanted to stay consistent. 🤷
We could think about aligning this in general though, i.e., switch multicsv to multi-file too and align the app names. Though, the mention of Excel makes it a little easier to see whether it's a relevant example, I think.
All in all, I don't have a strong opinion here, but would punt it for now if ok.

[merschformann]

Tests failing is curious as it passes everywhere else. I'll have to look into this later. 😊