make run.sh executable from within e2e (#619)

e2e/README.md

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+# Postgres Operator end-to-end tests
+
+End-to-end tests shall ensure that the Postgres Operator does its job when
+applying manifests against a Kubernetes (K8s) environment. A test runner
+Dockerfile is provided to run e2e tests without the need to install K8s and
+its runtime `kubectl` in advance. The test runner uses
+[kind](https://kind.sigs.k8s.io/) to create a local K8s cluster which runs on
+Docker.
+
+## Prerequisites
+
+Docker
+Go
+
+## Build test runner
+
+In the directory of the cloned Postgres Operator repository change to the e2e
+folder and run:
+
+```bash
+make
+```
+
+This will build the `postgres-operator-e2e-tests` image and download the kind
+runtime.
+
+## Run tests
+
+In the e2e folder you can invoke tests either with `make test` or with:
+
+```bash
+./run.sh
+```
+
+To run both the build and test step you can invoke `make e2e` from the parent
+directory.
+
+## Covered use cases
+
+The current tests are all bundled in [`test_e2e.py`](tests/test_e2e.py):
+
+* support for multiple namespaces
+* scale Postgres cluster up and down
+* taint-based eviction of Postgres pods
+* invoking logical backup cron job
+* uniqueness of master pod