File paths dynamic (#2605)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

---------

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Co-authored-by: a <a>

src/main/java/stirling/software/SPDF/service/SignatureService.java

@@ -13,14 +13,19 @@ import org.springframework.stereotype.Service;
 import org.thymeleaf.util.StringUtils;
 
 import lombok.extern.slf4j.Slf4j;
+import stirling.software.SPDF.config.InstallationPathConfig;
 import stirling.software.SPDF.model.SignatureFile;
 
 @Service
 @Slf4j
 public class SignatureService {
 
-    private static final String SIGNATURE_BASE_PATH = "customFiles/signatures/";
-    private static final String ALL_USERS_FOLDER = "ALL_USERS";
+    private final String SIGNATURE_BASE_PATH;
+    private final String ALL_USERS_FOLDER = "ALL_USERS";
+
+    public SignatureService() {
+        SIGNATURE_BASE_PATH = InstallationPathConfig.getSignaturesPath();
+    }
 
     public boolean hasAccessToFile(String username, String fileName) throws IOException {
         validateFileName(fileName);