Rework gradle latest versions

[cdsap]

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[greptile-apps]

Greptile Summary

This PR replaces the hard-coded Gradle enum with a data-driven data class backed by a supported-gradle-versions.txt resource file, and adds a weekly GitHub Actions workflow + shell script that automatically fetches the latest Gradle versions, regenerates wrapper bundles, and opens a PR — eliminating the need for manual version bumps going forward.

Key changes:

• Gradle is now a data class with lazy-loaded version list from the classpath resource, maintaining backward compatibility via legacyEnumName and the multi-key supportedLookup map.
• Gradle.latest() / Gradle.oldest() replace previously hard-coded enum constants throughout the codebase.
• New scripts/update_gradle_versions.sh automates version selection, wrapper bundle generation, stale-bundle pruning, and README update.
• New .github/workflows/update-gradle-versions.yml runs the script on a weekly Monday schedule and opens a PR with the results.
• New SupportedGradleVersionsE2ETest parameterises the E2E build test over all supported versions, ensuring regressions are caught automatically.
• The test name "supported gradle list is capped to five entries" contradicts the actual assertion of 6; the name should be updated.
• prune_removed_bundles in the shell script uses =~ with an unescaped $base filename as a regex pattern, causing the . in .zip to act as a wildcard rather than a literal character — this is technically incorrect but poses negligible practical risk given the controlled filename namespace.
• An unused selected = [] variable is present in the Python snippet inside fetch_versions.

Confidence Score: 4/5

• Safe to merge; the architectural change is clean and well-tested, with only minor issues in the shell script and a stale test name.
• The core Kotlin refactoring from enum to data class is solid, backward-compatible, and covered by both unit and E2E tests. The two issues in the shell script (unescaped regex in prune_removed_bundles and a dead selected variable) are low-risk. The test name mismatch is cosmetic but should be fixed to avoid confusion.
• scripts/update_gradle_versions.sh — regex escaping bug in prune_removed_bundles and unused variable in fetch_versions.

Important Files Changed

Filename	Overview
project-generator/src/main/kotlin/io/github/cdsap/projectgenerator/model/Gradle.kt	Replaces the hard-coded Gradle enum with a data class that loads supported versions lazily from a bundled resource file, enabling fully data-driven version management without code changes.
scripts/update_gradle_versions.sh	New automation script that fetches the latest Gradle versions from the official feed, generates wrapper bundles, prunes stale ones, and updates the README — contains an unescaped regex special character in prune_removed_bundles and an unused selected variable in the Python snippet.
.github/workflows/update-gradle-versions.yml	New weekly scheduled workflow that runs the update script, executes tests, and opens a PR via peter-evans/create-pull-request@v7 — straightforward and scoped permissions look correct.
project-generator/src/test/kotlin/io/github/cdsap/projectgenerator/model/GradleTest.kt	New unit tests for the Gradle data class; logic is correct but the test name "capped to five entries" contradicts the actual assertion of 6.
project-generator/src/test/kotlin/io/github/cdsap/projectgenerator/SupportedGradleVersionsE2ETest.kt	New parameterised E2E test that generates and builds a JVM project for every supported Gradle version, providing good coverage of the new data-driven version list.
project-generator/src/main/kotlin/io/github/cdsap/projectgenerator/writer/GradleWrapper.kt	Minimal change: replaced the old gradle.name.lowercase() + ".zip" (enum-based) with gradle.resourceZipName (property on data class) — correct and consistent.
project-generator/src/main/resources/supported-gradle-versions.txt	New resource file listing the 6 currently supported Gradle versions (3 per major line for 8.x and 9.x); serves as the single source of truth read by Gradle.supportedVersions.
project-generator/src/main/kotlin/io/github/cdsap/projectgenerator/ProjectGenerator.kt	One-line change: default gradle parameter updated from the hard-coded Gradle.GRADLE_9_4_0 to the data-driven Gradle.latest() — correctly picks up new versions without code changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Weekly Schedule / workflow_dispatch] --> B[update_gradle_versions.sh]
    B --> C[fetch_versions\nGET services.gradle.org/versions/all]
    C --> D{Parse JSON\n3 minor lines per major\nfor Gradle 8 and 9}
    D --> E[Write supported-gradle-versions.txt]
    E --> F[generate_wrapper_bundle for each version]
    F --> G[Run gradlew wrapper with version flag]
    G --> H[Zip wrapper files into gradle_X_Y_Z.zip resource]
    H --> I[prune_removed_bundles - delete stale zip resources]
    I --> J[update_readme - Replace version list in README]
    J --> K[Run tests via Gradle]
    K --> L[Open PR with peter-evans/create-pull-request]

    subgraph Runtime - Gradle data class
        M[Gradle.supported] --> N[Load supported-gradle-versions.txt\nfrom classpath - lazy]
        N --> O[Build supportedLookup map\nversion + cliValue + legacyEnumName]
        O --> P[latest / oldest / fromValue]
    end

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