Setup CI pipeline

[vestrel00]

Continuous Delivery (CD) is already done using JitPack. Might as well use it for Continue Integration (CI) too 😁.

https://jitpack.io/docs/#continuous-integration-ci

[vestrel00]

Having some issues getting this to work on JitCI. I'm getting these errors;

> Task :listDeps
106.	Dependencies: 0 in project 'contacts-android'
107.	
108.	> Task :core:initAndroidSdk
109.	Android detected in project: core
110.	Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8 -Dhttps.protocols=TLSv1.2
111.	Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
112.		at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
113.		at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
114.		at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
115.		at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
116.		at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
117.	Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
118.		at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
119.		at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
120.		at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
121.		... 5 more
122.	Error initialising Android SDK: class org.gradle.process.internal.ExecException - Process 'command 'sh'' finished with non-zero exit value 1
123.	

Doing some google searches revealed that I either need to downgrade to Java 8 (which I can't do because this project's build tools require Java 11) OR use the command line tools to accept the licenses (but the tools are not in the virtual machine...

It's an interesting error because the actual Gradle build of the project succeeds. It's just these extra listDeps and initAndroidSdk commands that are failing.

[vestrel00]

Okay... So, just not executing the default "Init" stage commands did the trick!

I'm guessing those commands are no longer needed for Java 11 Android projects 🤷

I did not find this solution from Google searching. Maybe no one really uses JitCI? Strange... it is such a convenient, heavily Github-integrated service.

[vestrel00]

It is currently setup to build on push and the build is green so I'll close this issue! We might have to migrate to a different CI pipeline later or maybe not. For now, this should do. Each commit will show a ✅ if the build succeeds =)

P.S. The badge is grey and it just says "None", so I won't add it to the README. 😢 I was looking forward to adding another badge!

Seems like there is an issue about this; jitpack/jitci#18