[PR] Add a GitHub Actions build [ant]

slachiewicz opened a new pull request, #236:
URL: https://github.com/apache/ant/pull/236

   There is no CI configuration in the repository, so nothing checks a pull request
   on a second platform or a second JDK.
   
   This adds one workflow: the JUnit suite on Linux and Windows, on Java 8 and 11.
   Java 8 because CONTRIBUTING.md requires master to stay buildable on it, and
   Windows because that is the coverage contributors cannot easily provide for
   themselves.
   
   ### What it runs, and what it does not
   
   `./build.sh clean junit-report` rather than the full `test` target.
   `lib/optional/*.jar` is git-ignored, so the optional dependencies are fetched
   first, and it goes through `build.sh`/`build.bat` rather than `ant` - those pass
   `-lib lib/optional`, without which the AntUnit antlib cannot resolve.
   
   AntUnit is deliberately left out. Running `./build.sh clean test` against master
   on macOS:
   
   | JDK | JUnit | AntUnit |
   | --- | --- | --- |
   | 11 | 2362 run, 0 failures, 0 errors | 845 run, 3 failures, 35 errors |
   | 25 | 2362 run, 0 failures, 0 errors | 3 failures, 13 errors |
   
   The failures cluster in optional features - script engines, xz, xslt - so this
   may well be my environment rather than Ant. Either way a workflow that is red on
   the day it lands is worth less than one that is not. The comment in the file
   lists the affected build files. Working out what a green AntUnit run looks like
   per JDK and platform would make a good second step, and would let AntUnit join
   the matrix.
   
   ### Not verified
   
   I have neither JDK 8 nor 17 available locally and cannot run Windows, so the
   Java 8 legs and both Windows legs are unverified. The two cells I could measure,
   Java 11 and Java 25, are green with exactly the command above.
   
   17 and 25 look ready to add - Java 25 gives the same 2362 tests, 0 failures,
   0 errors - but starting narrow, on the view that a first workflow should assert
   only what the project already promises.
   
   Happy to take this to dev@ first if that is preferred.
   
   *This change was created with AI assistance.*
   


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