fix(extensions): fix gitignore template and bump version

[villebro]

User description

SUMMARY

Currently the .gitignore.j2 template was being ignored by the Python builder, likely due to security constraints (makes sense). I felt it's a better idea to just remove the leading dot from the template file than go messing about with the security configs (the generated file keeps the leading dot, ofc). Since we already have a test that ensures the creation of .gitignore, no tests needed to be updated.

TESTING INSTRUCTIONS

1. Run python -m build, unpack the generated source bundle and verify that gitignore.j2 is included in the bundle
2. Scaffold a new extension and verify that it completes successfully
3. Verify that <publisher>/<name>/.gitignore actually gets created. Note: it's hidden by default! so you need do do ls -a or similar

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

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CodeAnt-AI Description

Include gitignore template in packaged CLI and generate .gitignore when scaffolding; bump CLI version

What Changed

• The extension scaffolder now reads a packaged gitignore template and writes a .gitignore file into the new extension directory so generated projects include a proper .gitignore
• The scaffolded .gitignore contains standard ignore rules for Node modules, build outputs, Python artifacts, IDE files, OS files, logs, and environment files
• The CLI package version advanced from 0.1.0rc1 to 0.1.0rc2

Impact

✅ Scaffolded extensions include .gitignore
✅ New projects start with common ignore patterns (Node, Python, IDE, OS, env, logs)
✅ Packaged CLI contains the gitignore template for reliable scaffolding

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[bito-code-review]

Code Review Agent Run #9ad6f4

Actionable Suggestions - 0

Review Details

• Files reviewed - 2 · Commit Range: e7671c6..e7671c6

  • superset-extensions-cli/pyproject.toml
  • superset-extensions-cli/src/superset_extensions_cli/cli.py
• Files skipped - 0
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[codeant-ai-for-open-source]

Sequence Diagram

This PR fixes extension scaffolding by renaming the template file so it is included in package builds, while keeping the generated output as .gitignore. The flow now reliably packages gitignore.j2 and uses it during init.

sequenceDiagram
    participant Developer
    participant BuildSystem
    participant TemplateFiles
    participant CLI
    participant NewExtension

    Developer->>BuildSystem: Build extensions cli package
    BuildSystem->>TemplateFiles: Include gitignore.j2 in source bundle
    Developer->>CLI: Run extension init
    CLI->>TemplateFiles: Load and render gitignore.j2
    CLI->>NewExtension: Write .gitignore file
    CLI-->>Developer: Extension scaffold created successfully

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.19%. Comparing base (d4f1f8d) to head (e7671c6).
⚠️ Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #38614      +/-   ##
==========================================
+ Coverage   65.01%   65.19%   +0.17%     
==========================================
  Files        1817     1822       +5     
  Lines       72318    72839     +521     
  Branches    23032    23032              
==========================================
+ Hits        47016    47484     +468     
- Misses      25302    25355      +53     

Flag	Coverage Δ
superset-extensions-cli	89.82% <100.00%> (?)

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[michael-s-molina]

Thanks @villebro! I'll update the PyPI package when cutting Superset 6.1.0 RC2 as we might have other fixes before then.