Ensure distribution archive has execute permissions for files

Adjust the zip creation during gradle target distZip,
to include execute file permissions for archived files.
So that the archive can be unpacked and directly used,
on Unix platforms.

Fixes: spotbugs#2540

CHANGELOG.md

@@ -32,6 +32,7 @@ Currently the versioning policy of this project follows [Semantic Versioning v2.
 - Updated the MS_EXPOSE_REP description to mention mutable objects, not just arrays ([#1669](https://github.com/spotbugs/spotbugs/issues/1669))
 - Described Configuration option frc.suspicious for bug RC_REF_COMPARISON in bug description ([#2297](https://github.com/spotbugs/spotbugs/issues/2297))
 - Fixed FindHEMismatch not reporting HE_SIGNATURE_DECLARES_HASHING_OF_UNHASHABLE_CLASS for some classes ([#2402](https://github.com/spotbugs/spotbugs/issues/2402))
+- Added execute file permission to files in the distribution zip  ([#2540](https://github.com/spotbugs/spotbugs/issues/2540))
 
 ### Added
 - New simple name-based AnnotationMatcher for exclude files (now bug annotations store the class java annotations in an attribute called `classAnnotationNames`). For example, use like <Match><Annotation name="org.immutables.value.Generated" /></Match> in an excludeFilter.xml to ignore classes generated by the Immutable framework. This ignores all class, method or field bugs in classes with that annotation.

spotbugs/build.gradle

@@ -283,6 +283,7 @@ tasks.named('distTar', Tar) {
 }
 def distZip = tasks.named('distZip', Zip) {
   duplicatesStrategy = DuplicatesStrategy.FAIL
+  fileMode 0755
 }
 tasks.named('jar') {
   dependsOn tasks.named('updateManifest')