Run tests with JDK8 in GitHub actions

[jbescos]

Adding JDK8 to make sure there are no runtime errors with JDK8.

Currently test are failing because of test errors, which is actually what we wanted:

java.lang.ArrayStoreException
	at java.lang.System.arraycopy(Native Method)
	at java.util.ArrayList.toArray(ArrayList.java:414)
	at jakarta.activation.MailcapCommandMap.<init>(MailcapCommandMap.java:181)
	at jakarta.activation.CommandMap.getDefaultCommandMap(CommandMap.java:60)
	at jakarta.activation.DataHandler.getCommandMap(DataHandler.java:128)
	at jakarta.activation.DataHandler.getDataContentHandler(DataHandler.java:590)
	at jakarta.activation.DataHandler.writeTo(DataHandler.java:290)
	at jakarta.mail.internet.MimeUtility.getEncoding(MimeUtility.java:316)
	at jakarta.mail.internet.MimeBodyPart.updateHeaders(MimeBodyPart.java:1580)
	at jakarta.mail.internet.MimeMessage.updateHeaders(MimeMessage.java:2265)
	at jakarta.mail.internet.MimeMessage.saveChanges(MimeMessage.java:2225)
	at jakarta.mail.internet.MimeMessage.writeTo(MimeMessage.java:1904)
	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1329)

This will work when this PR is merged and we update the version of angus-activation.

I keep this as a draft till that moment happens to keep the builds green.

You can test this following these steps: eclipse-ee4j/angus-activation#11

[lukasj]

time to rebase this on master and finalize...

[jbescos]

time to rebase this on master and finalize...

Done, but we have to wait for a new release of activation. Then I will update the pom.xml to use it, and we can merge it.

[lukasj]

ang-activation 2.0.0 is already in staging and integrated here, just rebase on top of master...

[jbescos]

ang-activation 2.0.0 is already in staging and integrated here, just rebase on top of master...

It looks there is a new issue:

Error:  COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
Error:  /home/runner/work/angus-mail/angus-mail/core/src/main/java/com/sun/mail/nativeimage/AngusMailFeature.java:[23,38] cannot access org.graalvm.nativeimage.hosted.Feature
  bad class file: /home/runner/.m2/repository/org/graalvm/sdk/graal-sdk/22.3.0/graal-sdk-22.3.0.jar(org/graalvm/nativeimage/hosted/Feature.class)
    class file has wrong version 55.0, should be 52.0
    Please remove or make sure it appears in the correct subdirectory of the classpath.

It seems that graal dependency was not compiled for JDK 8.

[lukasj]

prefer exclusion of the file from the build on JDK 8 over changing graalvm version

[lukasj]

LGTM