Play tests on GitHub CI

[apupier]

do not merge right away as there are currently tests failing, for instance:

[ERROR] Failures: 
[ERROR] sample.camel.MyCamelApplicationTest.shouldPushConvertedHl7toFhir
[ERROR]   Run 1: MyCamelApplicationTest.shouldPushConvertedHl7toFhir:46 mock://fhir:transaction/withResources Received message count. Expected: <1> but was: <0>
[ERROR]   Run 2: MyCamelApplicationTest.shouldPushConvertedHl7toFhir:46 mock://fhir:transaction/withResources Received message count. Expected: <1> but was: <0>
[ERROR]   Run 3: MyCamelApplicationTest.shouldPushConvertedHl7toFhir:46 mock://fhir:transaction/withResources Received message count. Expected: <1> but was: <0>

[apupier]

proposed fix for the failing test #140 (which are the only ones)

[apupier]

fix for the example merged.
Now all tests are passing