Loosen requirement on regex to allow blob URLs

Single file URLs now work but do not contain the whole workflow in the RO bundle

Author: Mark Robinson

src/main/java/org/commonwl/viewer/services/GitHubService.java

@@ -56,7 +56,7 @@ public class GitHubService {
     private final RepositoryService repoService;
 
     // URL validation for directory links
-    private final String GITHUB_DIR_REGEX = "^https:\\/\\/github\\.com\\/([A-Za-z0-9_.-]+)\\/([A-Za-z0-9_.-]+)\\/?(?:tree\\/([^/]+)\\/(.*))?$";
+    private final String GITHUB_DIR_REGEX = "^https?:\\/\\/github\\.com\\/([A-Za-z0-9_.-]+)\\/([A-Za-z0-9_.-]+)\\/?(?:(?:tree|blob)\\/([^/]+)\\/(.*))?$";
     private final Pattern githubDirPattern = Pattern.compile(GITHUB_DIR_REGEX);
 
     @Autowired