Revert "#2 fix: add the config to check with external source"

This reverts commit fe1b4d8.

(cherry picked from commit 23c6c0a)

.github/workflows/shellcheck.yml

@@ -17,4 +17,3 @@ jobs:
         uses: ludeeus/action-shellcheck@master
         with:
           check_together: 'yes'
-          external: 'yes'

runner.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 set -a
+# shellcheck disable=SC1091
 source .env
 set +a
 set -ue