Add workflow and fixes for building universal JAR file and Linux (#19)

* Add GitHub Actions workflow for building Android and Desktop

* Add workflow for building native deb and jar file

* Fix line indentation

* Change target formats

---------

Co-authored-by: Pablo García Santamaría <69808296+PGSCOM@users.noreply.github.com>
Co-authored-by: Mathew Tkachuk <me@crx.moe>

composeApp/build.gradle.kts

@@ -100,7 +100,7 @@ compose.desktop {
         }
 
         nativeDistributions {
-            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            targetFormats(TargetFormat.Dmg, TargetFormat.Exe, TargetFormat.AppImage)
             packageName = "overport"
             packageVersion = appVersion
 
@@ -120,3 +120,21 @@ compose.desktop {
         }
     }
 }
+
+tasks.withType<org.gradle.jvm.tasks.Jar> {
+    // Need for valid signature check
+    exclude(
+        "META-INF/*.SF",
+        "META-INF/*.DSA",
+        "META-INF/*.RSA",
+        "META-INF/*.EC"
+    )
+
+    exclude(
+        "META-INF/INDEX.LIST",
+        "META-INF/DEPENDENCIES",
+        "META-INF/LICENSE*",
+        "META-INF/NOTICE*"
+    )
+}
+