Merge pull request #2644 from guusdk/tests-improve-speed #3509

Job	Run time
Build Openfire from source (17, zulu)	6m 14s
check_branch	1s
Build Openfire from source (21, zulu)	5m 57s
Check if database upgrade tests should be run	3s
Build (and maybe push) Docker image	14m 0s
Execute aioxmpp-based CI tests	1m 49s
Execute Connectivity CI tests	26s
Test Postgres Upgrades	53s
Execute Smack-based CI tests	52s
Test SQL Server Upgrades	1m 23s
Generate DEB artifact	1m 22s
Test MySQL Upgrades	1m 5s
Check if Docker Hub secrets exist	1s
Publish to Maven	1m 58s
Publish to Docker Hub	0s
Test tagged images published to Docker Hub	0s
	36m 4s

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