For more information see
https://docs.openshift.com/container-platform/4.12/applications/deployments/what-deployments-are.html

Since OpenShift 4.14 DeploymentConfigs are deprecated. https://access.redhat.com/articles/7041372

Strategy 'Rolling' does not exist in Deployments and has to be migrated
to 'RollingUpdate' as well.

Signed-off-by: Petr "Stone" Hracek <phracek@redhat.com>

Based on the `oc api-resources` the apiVersions should be

$ oc api-resources | grep imagestreams
imagestreams                          is                  image.openshift.io/v1                         true         ImageStream
$ oc api-resources | grep routes
routes                                                    route.openshift.io/v1                         true         Route
$ oc api-resources | grep deploymentconfig
deploymentconfigs                     dc                  apps.openshift.io/v1                          true         DeploymentConfig
$ oc api-resources | grep templates
templates                                                 template.openshift.io/v1                      true         Template

Signed-off-by: Petr "Stone" Hracek <phracek@redhat.com>

Do not include ubi7 as example because Django 2.2.x requires newer sqlite than what we have in RHEL 7

Addresses openshift/origin#19998

Recreate strategy will allow the redeployment process to stay within
1Gi memory limit instead of requiring more memory due to extra pod
is created for Rolling strategy.

Signed-off-by: Vu Dinh <vdinh@redhat.com>

The new PIP_INDEX_URL parameter is added to allow custom PyPi mirror
URL to be used during the build process.

There are several paramaters that are required but didn't listed as
requested (*). Now, they are marked as required to be explicit.

Signed-off-by: Vu Dinh <vdinh@redhat.com>