Complete 26.3 parity acceptance and dual-version release workflow

scripts/changed_targets.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+"""Select affected game targets; docs and release tooling do not trigger game tests."""
+import argparse
+import json
+import subprocess
+
+
+def affected(paths):
+    targets = set()
+    for path in paths:
+        if path.startswith("src/main/java/") or path in {"build.gradle", "settings.gradle", "gradle.properties"}:
+            targets.add("mc1211")
+        if path.startswith("ports/mc263/") and not path.endswith(".md"):
+            targets.add("mc263")
+        if path.startswith(("src/main/resources/", "src/generated/", "buildSrc/", "gradle/")) or path in {"gradlew", "gradlew.bat"}:
+            targets.update(("mc1211", "mc263"))
+    return sorted(targets)
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("--base", required=True)
+    args = parser.parse_args()
+    paths = subprocess.check_output(["git", "diff", "--name-only", args.base, "HEAD"], text=True).splitlines()
+    values = {"mc1211": ("21", "build"), "mc263": ("25", "-p ports/mc263 build")}
+    matrix = {"include": [{"target": target, "java": values[target][0], "gradle_args": values[target][1]}
+                          for target in affected(paths)]}
+    print(json.dumps(matrix, separators=(",", ":")))
+
+
+if __name__ == "__main__":
+    main()