Add reusable workflow for e2e test job

In this commit, We are adding reusable workflow for e2e job,
this workflow will be used by other operators in
openstack-k8s-operators organization.

In this workflow:-
* We build individual operator container images using PR content.
* Build openstack operator(passing the Individual Operator bundle image
  we build earlier)
* We start a SNO OCP cluster in an OpenStack cloud.
* Install operator on OCP cluster using meta operator.
* Do basic Service tests.

Apart from workflow, we are adding some basic shell scripts that will be consumed by the workflow.

Author: Sandeepyadav93

.github/cluster_pre_steps.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -ex
+oc whoami
+for i in `oc get csr |grep Pending |awk '{print $1}'`; do oc adm certificate approve $i; done
+sleep 30

.github/install_operator_with_hash.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+set -ex
+export $(echo ${1^^} | cut -d '-' -f1)_IMG=$2/$1-index:$3
+
+cd $HOME
+rm -rf install_yamls
+git clone https://github.com/openstack-k8s-operators/install_yamls.git
+cd $HOME/install_yamls
+make crc_storage
+sleep 20
+make openstack
+sleep 150
+make openstack_deploy
+sleep 240

.github/operators_post_tests.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+set -ex
+
+# Print basic outputs for debug
+oc get pods -n openstack
+
+# Create clouds.yaml file to be used in further tests.
+mkdir -p ~/.config/openstack
+cat > ~/.config/openstack/clouds.yaml << EOF
+$(oc get cm openstack-config -n openstack -o json | jq -r '.data["clouds.yaml"]')
+EOF
+export OS_CLOUD=default
+export OS_PASSWORD=$(oc get secret $(oc get keystoneapi keystone -o json | jq -r .spec.secret) -o json | jq -r .data.$(oc get keystoneapi keystone -o json | jq -r .spec.passwordSelectors.admin) | base64 -d)
+
+# Post tests for mariadb-operator
+# Check to confirm they we can login into mariadb container and show databases.
+mariadb_password=$(oc get secret $(oc get mariadb openstack -o json | jq -r .spec.secret) -o json | jq -r .data.DbRootPassword | base64 -d)
+oc exec -it  pod/mariadb-openstack -- mysql -uroot -p$mariadb_password -e "show databases;"
+
+# Post tests for keystone-operator
+# Check to confirm you can issue a token.
+openstack token issue

.github/sno_heat_stack.yaml

@@ -0,0 +1,70 @@
+heat_template_version: 2016-10-14
+
+parameters:
+  flavor:
+    type: string
+    description: 16G flavor
+    default: ci.m1.xxlarge
+    constraints:
+      - custom_constraint: nova.flavor
+  image:
+    type: string
+    description: SNO Snapshot
+    default: sno-bcqhp-master-0_10.0.131.137_test
+    constraints:
+      - custom_constraint: glance.image
+
+resources:
+  heat_network:
+    type: OS::Neutron::Net
+    properties:
+      admin_state_up: true
+      name: sno_network
+  heat_network_subnet:
+    type: OS::Neutron::Subnet
+    properties:
+      network: { get_resource: heat_network }
+      cidr: "10.0.128.0/17"
+      gateway_ip: "10.0.128.1"
+      ip_version: 4
+  heat_router:
+    type: OS::Neutron::Router
+    properties:
+      external_gateway_info: { network: public }
+      name: heat_router
+  heat_router_interface:
+    type: OS::Neutron::RouterInterface
+    properties:
+      router_id: { get_resource: heat_router }
+      subnet: { get_resource: heat_network_subnet }
+  heat_server_port:
+    type: OS::Neutron::Port
+    properties:
+      network: { get_resource: heat_network }
+      fixed_ips:
+        - subnet_id: { get_resource: heat_network_subnet }
+          ip_address: 10.0.131.137
+      security_groups:
+        - sno-bcqhp-master
+  heat_server:
+    type: OS::Nova::Server
+    properties:
+      name: sno-bcqhp-master-0
+      flavor: { get_param: flavor }
+      image: { get_param: image }
+      networks:
+        - port: { get_resource: heat_server_port}
+  heat_server_public_ip:
+    type: OS::Neutron::FloatingIP
+    properties:
+      floating_network: "public"
+  heat_server_ip_assoc:
+    type: OS::Neutron::FloatingIPAssociation
+    properties:
+      floatingip_id: { get_resource: heat_server_public_ip }
+      port_id: { get_resource: heat_server_port }
+
+outputs:
+  heat_server_public_ip:
+    description: IP Address of the deployed heat_server instance
+    value: { get_attr: [ heat_server_public_ip, floating_ip_address ]}