Fix: Remove signing config for F-Droid compatibility

F-Droid strips signing configs during build, but the fallback to
debug signing caused APKs to be named without '-unsigned' suffix,
breaking the expected output path in F-Droid metadata.

Author: mretallack

app/build.gradle

@@ -15,23 +15,11 @@ android {
         base.archivesName = 'cams'
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
-    signingConfigs {
-        release {
-            def ks = System.getenv("KEYSTORE_PATH")
-            if (ks != null) {
-                storeFile file(ks)
-                storePassword System.getenv("KEYSTORE_PASSWORD")
-                keyAlias System.getenv("KEY_ALIAS")
-                keyPassword System.getenv("KEY_PASSWORD")
-            }
-        }
-    }
     buildTypes {
         release {
             minifyEnabled false
             shrinkResources false
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
-            signingConfig System.getenv("KEYSTORE_PATH") != null ? signingConfigs.release : signingConfigs.debug
         }
     }
     compileOptions {