CPackDeb: sort package files before generating deb file

This should make the order in which the files are added to md5sums
and archives is stable, thus making package files more reproducible.

Fixes: #22361

Source/CPack/cmCPackDebGenerator.cxx

@@ -2,6 +2,7 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmCPackDebGenerator.h"
 
+#include <algorithm>
 #include <cstdlib>
 #include <cstring>
 #include <map>
@@ -525,6 +526,8 @@ int cmCPackDebGenerator::PackageOnePack(std::string const& initialTopLevel,
       return 0;
     }
     this->packageFiles = gl.GetFiles();
+    // Sort files so that they have a reproducible order
+    std::sort(this->packageFiles.begin(), this->packageFiles.end());
   }
 
   int res = this->createDeb();
@@ -551,6 +554,8 @@ int cmCPackDebGenerator::PackageOnePack(std::string const& initialTopLevel,
       return 0;
     }
     this->packageFiles = gl.GetFiles();
+    // Sort files so that they have a reproducible order
+    std::sort(this->packageFiles.begin(), this->packageFiles.end());
 
     res = this->createDbgsymDDeb();
     if (res != 1) {
@@ -672,6 +677,8 @@ int cmCPackDebGenerator::PackageComponentsAllInOne(
     return 0;
   }
   this->packageFiles = gl.GetFiles();
+  // Sort files so that they have a reproducible order
+  std::sort(this->packageFiles.begin(), this->packageFiles.end());
 
   int res = this->createDeb();
   if (res != 1) {