Move Javadoc build script into .github and add CI workflow

[shai-almog]

Motivation

• Centralize the Javadoc build flow used by CI and releases so the same script is reused in PRs and release pipelines.
• Ensure Javadoc generation follows the CI Java 25 invocation and produces an artifact that can be packaged with releases.
• Replace the old repository-root script with a predictable, CI-friendly script under .github so workflows can validate and attach the archive.

Description

• Add a reusable script .github/scripts/build_javadocs.sh that copies sources, injects a minimal ImplementationFactory stub, runs javadoc (using JDK_25_HOME/JAVA_HOME when available), and produces CodenameOne/javadocs.zip.
• Add a GitHub Actions workflow .github/workflows/javadocs.yml that runs on pull_request, push to main/master, and published release events, verifies CodenameOne/javadocs.zip, uploads it as an artifact, and attaches it to releases.
• Update the PR workflow in .github/workflows/pr.yml to reuse the shared script for the JavaDocs step.
• Update CodenameOne/build.xml to call the new script and remove the deprecated CodenameOne/build_javadoc.sh file.

Testing

• No automated tests were executed locally as part of this change because it only modifies CI/build scripts and workflows.
• A CI workflow Build JavaDocs was added that will validate the script when runs occur by checking for CodenameOne/javadocs.zip and uploading it as an artifact in CI.

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Codex Task

[github-actions]

✅ Continuous Quality Report

Test & Coverage

• ✅ Tests: 2283 total, 0 failed, 0 skipped
• 📊 Line coverage: 52.78% [HTML preview] [Download]
  • Lowest covered classes
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertyListActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsPropertiesActionListener – 0.00%
    • com.codename1.ui.Display$EdtException – 0.00%
    • com.codename1.ui.BrowserWindow$BrowserForm – 0.00%
    • com.codename1.ui.plaf.CSSBorder$LinearGradient – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsStringAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsJsonMapActionListener – 0.00%
    • com.codename1.payment.Purchase$SynchronizeReceiptsSyncRunnable – 0.00%
    • com.codename1.io.rest.RequestBuilder$GetAsBytesAsyncImplActionListener – 0.00%
    • com.codename1.io.rest.RequestBuilder$FetchAsJsonMapActionListener – 0.00%

Static Analysis

• ✅ SpotBugs: 0 findings (no issues) [Report archive]
• ✅ PMD: 0 findings (no issues) [Report archive]
• ❌ Checkstyle: 112 findings (Error: 112) [HTML preview] [Download]
  • Top findings
    • Error: CodenameOne/src/com/codename1/javascript/JSFunction.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/javascript/JSException.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/annotations/Async.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/io/tar/TarEntry.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • Error: CodenameOne/src/com/codename1/io/tar/TarHeader.java:1 – File does not end with a newline. (rule: NewlineAtEndOfFileCheck)
    • …and 107 more

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