tests: Add README for integration tests

Signed-off-by: Xuanwo <github@xuanwo.io>

Author: Xuanwo

tests/README.md

@@ -0,0 +1,32 @@
+## How run azblob integration tests
+
+### Run tests locally
+
+Copy example files and update corresponding values.
+
+```shell
+cp Makefile.env.exmaple Makefile.env
+```
+
+Run tests
+
+```shell
+make integration_test
+```
+
+### Run tests in CI
+
+Set following environment variables:
+
+```shell
+export STORAGE_AZBLOB_INTEGRATION_TEST=on
+export STORAGE_AZBLOB_CREDENTIAL=hmac:access_key:secret_key
+export STORAGE_AZBLOB_NAME=bucketname
+export STORAGE_AZBLOB_ENDPOINT=https:accountname.blob.core.windows.net
+```
+
+Run tests
+
+```shell
+make integration_test
+```