Wordpress: Create a rockfile to replace the current Dockerfile #647

Job	Run time
Integration Test (With Secrets)	15m 57s
Integration Test / Get runner image / Get runner image	4s
Integration Test / Build and push charm	7m 21s
Integration Test / Build image / Get images	5s
Integration Test / Build rock / Get rocks	14s
Integration Test / Build rock / Build rock (wordpress_rock)	10m 43s
Integration Test / Build image / Build image	0s
Integration Test / Get rocks or Docker images	3s
Integration Test / Integration tests / Integration tests (test_addon)	30m 36s
Integration Test / Integration tests / Integration tests (test_core)	23m 37s
Integration Test / Integration tests / Integration tests (test_ingress)	26m 55s
Integration Test / Integration tests / Integration tests (test_cos_grafana)	25m 38s
Integration Test / Integration tests / Integration tests (test_cos_loki)	23m 29s
Integration Test / Integration tests / Integration tests (test_cos_prometheus)	26m 1s
Integration Test / Required Integration Test Status Checks	2s
	3h 10m 45s

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