SQL tests fail in the Quarkus Platform

[jamesnetherton]

Bug description

One of many recent test class loading issues. Apparently still awaiting a fix.

Caused by: java.util.ServiceConfigurationError: io.smallrye.config.ConfigSourceFactory: Provider org.apache.camel.quarkus.component.sql.it.SqlConfigSourceFactory not found
	at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:593)
	at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.nextProviderClass(ServiceLoader.java:1219)
	at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1228)
	at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273)
	at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309)
	at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393)
	at io.smallrye.config.SmallRyeConfigBuilder.discoverSources(SmallRyeConfigBuilder.java:141)
	at io.smallrye.config.SmallRyeConfig$ConfigSources.buildSources(SmallRyeConfig.java:921)
	at io.smallrye.config.SmallRyeConfig$ConfigSources.<init>(SmallRyeConfig.java:851)
	at io.smallrye.config.SmallRyeConfig.<init>(SmallRyeConfig.java:88)
	at io.smallrye.config.SmallRyeConfigBuilder.build(SmallRyeConfigBuilder.java:772)
	at io.quarkus.test.junit.classloading.QuarkusTestConfigProviderResolver.<init>(QuarkusTestConfigProviderResolver.java:23)
	at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)
	... 58 more

[jamesnetherton]

Although there's a bug here, I don't see the value in having SqlConfigSourceFactory.

It seems to do two things:

1. Sets various quarkus.datasource properties from environment variables
2. Configures Derby for in-container or non-container testing

All of the quarkus.datasource config options are already capable of being set via environment variables, so item 1 is redundant. All Derby testing uses the Quarkus dev service, so 2 is also not needed.

So I propose to remove SqlConfigSourceFactory and update the SQL itest README notes.