chore: update .github/workflows/lint.yaml

Author: cloud-foundation-bot

.github/workflows/lint.yaml

@@ -35,7 +35,7 @@ jobs:
  - id: variables
  run: |
  MAKEFILE=$(find . -name Makefile -print -quit)
- if [ ! -z "$MAKEFILE" ]; then
+ if [ -z "$MAKEFILE" ]; then
  echo dev-tools=gcr.io/cloud-foundation-cicd/cft/developer-tools:1 >> "$GITHUB_OUTPUT"
  else
  VERSION=$(grep "DOCKER_TAG_VERSION_DEVELOPER_TOOLS := " $MAKEFILE | cut -d\ -f3)