#2270: External DB Support (#2457)

# Description

External DB support for Stirling PDF. You can now choose between the
default H2 or PostgreSQL by setting the new `enableCustomDatabase`
property to `true` or `false`.

To enable your own custom (PostgreSQL) database:
- Set `enableCustomDatabase` to `true`
- Add your database url to `customDatabaseUrl`
- Set your `username` and `password`

Closes #2270 

## Checklist

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have performed a self-review of my own code
- [x] I have attached images of the change if it is UI based
- [x] 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/)
- [x] My changes generate no new warnings
- [x] 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)

build.gradle

@@ -72,6 +72,29 @@ sourceSets {
 
         }
     }
+
+    test {
+        java {
+            if (System.getenv("DOCKER_ENABLE_SECURITY") == "false") {
+                exclude "stirling/software/SPDF/config/security/**"
+                exclude "stirling/software/SPDF/controller/api/UserControllerTest.java"
+                exclude "stirling/software/SPDF/controller/api/DatabaseControllerTest.java"
+                exclude "stirling/software/SPDF/controller/web/AccountWebControllerTest.java"
+                exclude "stirling/software/SPDF/controller/web/DatabaseWebControllerTest.java"
+                exclude "stirling/software/SPDF/model/ApiKeyAuthenticationTokenTest.java"
+                exclude "stirling/software/SPDF/model/AttemptCounterTest.java"
+                exclude "stirling/software/SPDF/model/AuthorityTest.java"
+                exclude "stirling/software/SPDF/model/PersistentLoginTest.java"
+                exclude "stirling/software/SPDF/model/SessionEntityTest.java"
+                exclude "stirling/software/SPDF/model/UserTest.java"
+                exclude "stirling/software/SPDF/repository/**"
+            }
+
+            if (System.getenv("STIRLING_PDF_DESKTOP_UI") == "false") {
+                exclude "stirling/software/SPDF/UI/impl/**"
+            }
+        }
+    }
 }
 
 openApi {
@@ -299,10 +322,12 @@ dependencies {
         implementation "org.springframework.boot:spring-boot-starter-oauth2-client:$springBootVersion"
 
 		implementation "org.springframework.session:spring-session-core:$springBootVersion"
+        implementation "org.springframework:spring-jdbc:6.2.1"
 
 	    implementation 'com.unboundid.product.scim2:scim2-sdk-client:2.3.5'
         // Don't upgrade h2database
         runtimeOnly "com.h2database:h2:2.3.232"
+        runtimeOnly "org.postgresql:postgresql:42.7.4"
         constraints {
             implementation "org.opensaml:opensaml-core:$openSamlVersion"
             implementation "org.opensaml:opensaml-saml-api:$openSamlVersion"