fix: add shellcheck disable SC2195 for Terraform-templated case statements

The $${} syntax is Terraform template escaping which shellcheck
doesn't understand. Added disable directive for both case statements
in the fetch() function.

registry/coder/modules/vault-cli/run.sh

@@ -27,12 +27,14 @@ fetch() {
   fi
 
   if [ -n "$${dest}" ]; then
+    # shellcheck disable=SC2195
     case "$${HTTP_CLIENT}" in
       curl) curl -sSL --fail "$${url}" -o "$${dest}" ;;
       wget) wget -O "$${dest}" "$${url}" ;;
       busybox) busybox wget -O "$${dest}" "$${url}" ;;
     esac
   else
+    # shellcheck disable=SC2195
     case "$${HTTP_CLIENT}" in
       curl) curl -sSL --fail "$${url}" ;;
       wget) wget -qO- "$${url}" ;;