Remove is_defined()

entrypoint.sh

@@ -1,10 +1,5 @@
 #!/bin/sh
 
-echo "${INPUT_COMMIT_MESSAGE}"
-echo "${INPUT_COMMIT_OPTIONS}"
-echo "${INPUT_BRANCH}"
-echo "${INPUT_FILE_PATTERN}"
-
 set -eu
 
 # Set up .netrc file with GitHub credentials
@@ -24,10 +19,6 @@ EOF
     git config --global user.name "GitHub Actions"
 }
 
-is_defined() {
-    [ ! -z "${1}" ]
-}
-
 # This section only runs if there have been file changes
 echo "Checking for uncommitted changes in the git working tree."
 if ! git diff --quiet