Add restore site task & restructure job templates

Partial https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/240

chart/cluster-tasks/templates/database-backup.yaml

-apiVersion: tekton.dev/v1beta1
-kind: ClusterTask
-metadata:
-  name: database-backup
-spec:
-  params:
-    - name: drupalSite
-      type: string
-      description: The name of the drupal site
-    - name: namespace
-      type: string
-      description: The namespace of the drupal site
-  workspaces:
-    - name: job
-  steps:
-    - name: database-backup
-      image: {{ .Values.openshiftCli.image }}
-      command:
-        - /bin/sh
-        - '-c'
-      args:
-      - |-
-        echo "--------------------------- Database backup ---------------------------"
-        echo "Drupal site name: $(params.drupalSite)"
-        export TASK=database-backup
-        export DRUPALSITE=$(params.drupalSite)
-        export NAMESPACE=$(params.namespace)
-        export SERVING_POD_IMAGE=$(oc get -n $(params.namespace) drupalsite/$(params.drupalSite) -o=jsonpath='{.status.servingPodImage}')
-        export ARGS="-f dbBackUp.sql"
-        envsubst < $(workspaces.job.path)/{{ .Values.jobTemplateFile }} | oc create -n $(params.namespace) -f -
-        oc wait --for=condition=complete job/$TASK-$(params.drupalSite)
-        jobStatus=$(oc get job/$TASK-$(params.drupalSite) -o=jsonpath='{.status.conditions[*].type}' | grep -i -E 'failed|complete' || echo "Failed")
-        echo "Job status: $jobStatus"
-        echo "Job logs:"
-        oc logs job/$TASK-$DRUPALSITE -n $(params.namespace)