build: escalate warnings to errors

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

buildSrc/src/main/java/BaseProjectConfig.kt

@@ -51,6 +51,7 @@ internal fun Project.configureForAllProjects() {
   }
   tasks.withType<KotlinCompile> {
     kotlinOptions {
+      allWarningsAsErrors = true
       jvmTarget = JavaVersion.VERSION_1_8.toString()
       freeCompilerArgs = freeCompilerArgs + additionalCompilerArgs
       languageVersion = "1.5"

buildSrc/src/main/java/PasswordStorePlugin.kt

@@ -38,6 +38,7 @@ class PasswordStorePlugin : Plugin<Project> {
           project.tasks.withType<JavaCompile> {
             options.compilerArgs.add("-Xlint:unchecked")
             options.isDeprecation = true
+            options.isWarnings = true
           }
         }
         is LibraryPlugin -> {