ci: Target lower java version by manipulating source on runner

.gitignore

@@ -5,3 +5,4 @@ build/
 *.class
 
 loader/src/main/java/sig.java
+loader/src/main/java/sign/signlink.java

client/build.gradle

@@ -8,7 +8,7 @@ dependencies {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_5
+    sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
 application {

deob-annotations/build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_5
+    sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
 tasks.withType(JavaCompile) {

loader/build.gradle

@@ -7,14 +7,21 @@ dependencies {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_1_5
+    sourceCompatibility = JavaVersion.VERSION_1_8
 }
 
 tasks.withType(JavaCompile) {
     options.encoding = 'UTF-8'
     options.compilerArgs << '-Xlint:unchecked' << '-Xlint:deprecation'
+
+    dependsOn("copySignlink")
 }
 
 tasks.withType(JavaExec) {
     workingDir = project.rootDir
 }
+
+tasks.register("copySignlink", Copy) {
+    from("../client/src/main/java/sign/signlink.java")
+    into("src/main/java/sign/")
+}