test(android): add github action workflow step for unit tests (#4177)

Fixes #2309 

Not sure how to test the workflow itself in this PR 🤔

---------

Signed-off-by: Jason Elie Bou Kheir <5115126+jasonboukheir@users.noreply.github.com>
Co-authored-by: Jamil <jamilbk@users.noreply.github.com>

.github/workflows/_kotlin.yml

@@ -62,7 +62,6 @@ jobs:
       - name: Run Test
         run: |
           # TODO: See https://github.com/firezone/firezone/issues/2311
-          # TODO: See https://github.com/firezone/firezone/issues/2309
           ./gradlew testReleaseUnitTest
       - name: Upload app bundle
         uses: actions/upload-artifact@v4

kotlin/android/app/src/test/java/dev/firezone/android/core/SampleTest.kt

@@ -0,0 +1,11 @@
+/* Licensed under Apache 2.0 (C) 2024 Firezone, Inc. */
+package dev.firezone.android.core
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class SampleTest {
+    @Test fun `test should pass`() {
+        assertTrue(true)
+    }
+}