Add e2e test run for chains

Add environment variables for chains e2e

Add e2e for manualapprovalgate

Add Document for E2E configuration

Author: pramodbindal

Diff for: .konflux/tekton/bundle-e2e-pipeline.yaml

@@ -236,6 +236,16 @@ spec:
             env:
               - name: KUBECONFIG
                 value: "/credentials/$(steps.get-kubeconfig.results.kubeconfig)"
+              - name: CHAINS_DOCKER_CONFIG_JSON
+                valueFrom:
+                  secretKeyRef:
+                    key: config.json
+                    name: quay-io-dockerconfig
             script: |
+              
+              export CHAINS_REPOSITORY=quay.io/openshift-pipeline/chainstest
+
               gauge run --tags="" --log-level=debug --verbose specs/pipelines/
               gauge run --tags="" --log-level=debug --verbose specs/metrics/
+              gauge run --tags="" --log-level=debug --verbose specs/chains/
+              gauge run --tags="" --log-level=debug --verbose specs/manualapprovalgate/

Diff for: docs/E2E.md

@@ -0,0 +1,23 @@
+# This  document explains about the e2e configuration in Konflux.
+
+#### Release Test Repo:
+Release tests are executed from this repo
+    https://github.com/openshift-pipelines/release-tests
+
+#### Required Secrets:
+To run the release tests we need to have below secrets in konflux tenant.
+
+- <b> github </b> <br/> 
+This Secret is required to access private repositories on Github. in absence of this tests related to private repos will fail.
+
+```
+    oc create secret generic github --from-literal=github-token=$GITHUB_TOKEN
+```
+
+
+* <b> quay-io-dockerconfig </b> <br/> 
+This secret is used to access repos from quay.io/openshift-pipeline
+```
+    oc create secret generic quay-io-dockerconfig --from-literal=config.json=$QUAY_DOCKERCONFIG
+```
+