check scripts recursively

.drone.yml

@@ -10,7 +10,8 @@ steps:
   - name: lint
     image: koalaman/shellcheck-alpine:stable
     commands:
-      - shellcheck ./wait-for
+      - shellcheck --version
+      - find ./overlay -type f -exec grep -Eq '^#!(.*/|.*env +)(sh|bash|ksh)' {} \; | xargs shellcheck
 
   - name: markdownlint
     image: thegeeklab/markdownlint-cli
@@ -119,6 +120,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: c302e7a32ae780992880870f63a96cba87d844baae7d6c9b89b2aa748cb1eb5a
+hmac: 5674f13422f7e69803be61274fbe4ff4d84c38cdd1679fb297b705868f895ca5
 
 ...