Update tests for type=env secret

Signed-off-by: Brett Calliss <brett@obligatory.email>

tests/secrets/docker-compose.yaml

@@ -31,6 +31,9 @@ services:
           uid: '103'
           gid: '103'
           mode: 400
+        - source: my_secret
+          target: ENV_SECRET
+          type: env
 
 secrets:
   my_secret:
@@ -43,4 +46,3 @@ secrets:
     name: my_secret_3
   file_secret:
     file: ./my_secret
-

tests/secrets/print_secrets.sh

@@ -4,3 +4,4 @@ ls -la /run/secrets/*
 ls -la /etc/custom_location
 cat /run/secrets/*
 cat /etc/custom_location
+env | grep SECRET