include information on setting the api key in main and for TestSupplier1

Author: Vlasis-Perdikidis

.env.template

@@ -24,12 +24,16 @@ TARGET_ENVIRONMENT=prxx
 
 # API Keys
 # ========
-# In order to find out the value of an environments given API key, follow these steps
+# In order to find out and set the value of NON_PROD_API_KEY follow these steps
 # 1. Log in to the AWS NHS Notify Suppliers Dev account
-# 2. Open the paramenter store and search for the parameter /dev/e2e/keys/apim/pr
+# 2. Open the paramenter store and search for the parameter /dev/e2e/keys/apim/pr (this key will use the supplier Supplier1)
+#    a. to use the supplier TestSupplier1, search for the parameter /dev/e2e/keys/apim/pr/secondary
+#       NOTE: this needs to be set to the NON_PROD_SECONDARY_API_KEY environment variable
+#    b. If you want to run against main, search for the parameter /dev/e2e/keys/apim/main
 # 3. Copy the decrypted "value"
 # Note: For INT and higher environments use developer portal https://identity.prod.api.platform.nhs.uk/
 export NON_PROD_API_KEY=xxx
+export NON_PROD_SECONDARY_API_KEY=xxx
 export INTEGRATION_API_KEY=xxx
 export PRODUCTION_API_KEY=xxx