Implement end-to-end tests with testcontainers

.gitlab-ci.yml

app/src/test/java/de/kuschku/quasseldroid/ExampleUnitTest.kt

build.gradle.kts

libquassel/build.gradle.kts

.../main/kotlin/de/kuschku/libquassel/io/CoroutineChannel.kt

...lin/de/kuschku/libquassel/io/FixedDeflaterOutputStream.kt

...kotlin/de/kuschku/libquassel/io/ReadableWrappedChannel.kt

...src/main/kotlin/de/kuschku/libquassel/io/StreamChannel.kt

...kotlin/de/kuschku/libquassel/io/WritableWrappedChannel.kt

...sel/src/main/kotlin/de/kuschku/libquassel/util/TlsInfo.kt

.../src/main/kotlin/de/kuschku/libquassel/util/X509Helper.kt

...sel/src/test/kotlin/de/kuschku/libquassel/EndToEndTest.kt

...src/test/kotlin/de/kuschku/libquassel/QuasselContainer.kt

...test/kotlin/de/kuschku/libquassel/TestX509TrustManager.kt

libquassel/src/test/resources/quasseltest.crt

libquassel/src/test/resources/quasseltest.key

protocol/build.gradle.kts

settings.gradle.kts