Avoid redundant compilation of archive name regex

Previously, the compilation of the regular expression used to convert the library name to the release archive root folder
and file name was done inside the function, which caused it to be compiled redundantly for every subsequent call. Moving
it to the package scope improves the function's efficiency.

Author: per1234

internal/libraries/archive/archive.go

@@ -94,10 +94,11 @@ func (archive *Archive) Create() error {
 	return nil
 }
 
+var zipFolderNamePattern = regexp.MustCompile("[^a-zA-Z0-9]")
+
 // zipFolderName returns the name to use for the folder.
 func zipFolderName(library *metadata.LibraryMetadata) string {
-	pattern := regexp.MustCompile("[^a-zA-Z0-9]")
-	return pattern.ReplaceAllString(library.Name, "_") + "-" + library.Version
+	return zipFolderNamePattern.ReplaceAllString(library.Name, "_") + "-" + library.Version
 }
 
 // getSizeAndCalculateChecksum returns the size and SHA-256 checksum for the given file.