feat: inject build-time variables via Gradle processResources

Replace hardcoded AppProperties values with Gradle ${} placeholders,
allowing version/channel/vendor to be configured via gradle.properties
or -P flags at build time.

Also refactor webhook configuration to flatten the properties hierarchy
by removing the intermediate WebhookProperties wrapper.

build.gradle.kts

@@ -5,6 +5,8 @@ plugins {
 }
 
 val artefactVersion: String by project
+val buildChannel: String by project
+val vendor: String by project
 
 group = "com.onixbyte.helix"
 version = artefactVersion
@@ -61,6 +63,16 @@ dependencies {
     testRuntimeOnly(libs.junit.launcher)
 }
 
+tasks.processResources {
+    filesMatching("application.yaml") {
+        expand(
+            "appVersion" to artefactVersion,
+            "channel" to buildChannel,
+            "vendor" to vendor
+        )
+    }
+}
+
 tasks.test {
     useJUnitPlatform()
 }

src/main/java/com/onixbyte/deltaforceguide/config/WebhookConfig.java

@@ -1,10 +1,10 @@
 package com.onixbyte.deltaforceguide.config;
 
-import com.onixbyte.deltaforceguide.properties.WebhookProperties;
+import com.onixbyte.deltaforceguide.properties.GitHubWebhookProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Configuration;
 
 @Configuration
-@EnableConfigurationProperties(WebhookProperties.class)
+@EnableConfigurationProperties({GitHubWebhookProperties.class})
 public class WebhookConfig {
 }

src/main/java/com/onixbyte/deltaforceguide/interceptor/GitHubWebhookInterceptor.java

@@ -48,7 +48,7 @@ public class GitHubWebhookInterceptor implements HandlerInterceptor {
                     "Request body is not readable");
         }
 
-        var secret = webhookManager.github().secret();
+        var secret = webhookManager.secret();
         if (secret == null || secret.isBlank()) {
             log.debug("No GitHub webhook secret configured, skipping signature verification");
             return true;

src/main/java/com/onixbyte/deltaforceguide/manager/AppManager.java

@@ -18,6 +18,10 @@ public class AppManager {
      * @return the version string of this application
      */
     public String getVersion() {
-        return appProperties.version();
+        return "v%s-%s by @%s".formatted(
+                appProperties.version(),
+                appProperties.channel(),
+                appProperties.vendor()
+        );
     }
 }

src/main/java/com/onixbyte/deltaforceguide/manager/WebhookManager.java

@@ -1,21 +1,24 @@
 package com.onixbyte.deltaforceguide.manager;
 
 import com.onixbyte.deltaforceguide.properties.GitHubWebhookProperties;
-import com.onixbyte.deltaforceguide.properties.WebhookProperties;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
+import java.util.List;
+
 @Component
 public class WebhookManager {
 
-    private final WebhookProperties webhookProperties;
+    private final GitHubWebhookProperties gitHubWebhookProperties;
 
-    @Autowired
-    public WebhookManager(WebhookProperties webhookProperties) {
-        this.webhookProperties = webhookProperties;
+    public WebhookManager(GitHubWebhookProperties gitHubWebhookProperties) {
+        this.gitHubWebhookProperties = gitHubWebhookProperties;
     }
 
-    public GitHubWebhookProperties github() {
-        return webhookProperties.github();
+    public String secret() {
+        return gitHubWebhookProperties.secret();
+    }
+
+    public List<String> allowedUsers() {
+        return gitHubWebhookProperties.allowedUsers();
     }
 }

src/main/java/com/onixbyte/deltaforceguide/properties/AppProperties.java

@@ -4,6 +4,8 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 
 @ConfigurationProperties(prefix = "app.common")
 public record AppProperties(
-        String version
+        String version,
+        String channel,
+        String vendor
 ) {
 }

src/main/java/com/onixbyte/deltaforceguide/properties/GitHubWebhookProperties.java

@@ -1,7 +1,10 @@
 package com.onixbyte.deltaforceguide.properties;
 
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
 import java.util.List;
 
+@ConfigurationProperties(prefix = "app.webhook.github")
 public record GitHubWebhookProperties(
         String secret,
         List<String> allowedUsers

src/main/java/com/onixbyte/deltaforceguide/properties/WebhookProperties.java

@@ -1,9 +0,0 @@
-package com.onixbyte.deltaforceguide.properties;
-
-import org.springframework.boot.context.properties.ConfigurationProperties;
-
-@ConfigurationProperties(prefix = "app.webhook")
-public record WebhookProperties(
-        GitHubWebhookProperties github
-) {
-}

src/main/java/com/onixbyte/deltaforceguide/service/WebhookService.java

@@ -172,7 +172,7 @@ public class WebhookService {
     private boolean isAllowedSender(
             GitHubWebhookSender sender
     ) {
-        var allowedUsers = webhookManager.github().allowedUsers();
+        var allowedUsers = webhookManager.allowedUsers();
         if (allowedUsers == null || allowedUsers.isEmpty()) {
             return true;
         }

src/main/resources/application.yaml

@@ -39,13 +39,13 @@ mybatis:
   type-handlers-package: com.onixbyte.deltaforceguide.mapper.handler
   mapper-locations: classpath:/mapper/*.xml
 
-app:
-  webhook:
-    github:
-      secret: ${GITHUB_WEBHOOK_SECRET:}
-      allowed-users: []
-
 logging:
   level:
     org.hibernate:
       orm.connections.pooling: off
+
+app:
+  common:
+    version: ${appVersion}
+    channel: ${channel}
+    vendor: ${vendor}