message: [gha][lbt] fix repro command extra newlines
  Closes:
diff: @@ -76,24 +76,16 @@ jobs:
  date
  export CTI_OUTPUT_LOG=$(mktemp)
  echo "::set-env name=CTI_OUTPUT_LOG::$CTI_OUTPUT_LOG"
  + cmd=""
  if [ $TEST_COMPAT -eq 1 ]; then
  - ./scripts/cti \
  - --tag ${PREV_TAG} \
  - --cluster-test-tag ${TEST_TAG} \
  - -E RUST_LOG=debug \
  - -E BATCH_SIZE=15 \
  - -E UPDATE_TO_TAG=${TEST_TAG} \
  - -E DISABLE_FN_UPGRADE=1 \
  - --report report.json \
  - --suite land_blocking_compat
  + cmd="./scripts/cti --tag ${PREV_TAG} --cluster-test-tag ${TEST_TAG} -E RUST_LOG=debug -E BATCH_SIZE=15 -E UPDATE_TO_TAG=${TEST_TAG} -E DISABLE_FN_UPGRADE=1 --report report.json --suite land_blocking_compat"
  else
  - ./scripts/cti \
  - --tag ${TEST_TAG} \
  - -E RUST_LOG=debug \
  - --report report.json \
  - --suite land_blocking
  + cmd="./scripts/cti --tag ${TEST_TAG} -E RUST_LOG=debug --report report.json --suite land_blocking"
  fi
  + eval $cmd
  ret=$?
  + echo "cti exit code: $ret"
  + echo "::set-env name=CTI_REPRO_CMD::$cmd"
  echo "::set-env name=CTI_EXIT_CODE::$ret"
  if [ -s "report.json" ]; then
  echo "report.json start"
  @@ -200,19 +192,12 @@ jobs:
  }
  // Add repro cmd to message
  try {
  - if (parseInt(env_vars.TEST_COMPAT) === 1) {
  body += "\nRepro cmd:\n";
  body += `
  - ./scripts/cti --tag ${env_vars.PREV_TAG} --cluster-test-tag ${env_vars.TEST_TAG} \\ \n
  - -E BATCH_SIZE=15 -E UPDATE_TO_TAG=${env_vars.TEST_TAG} -E DISABLE_FN_UPGRADE=1 \\ \n
  - --suite land_blocking_compat
  - `;
  - } else {
  - body += "\nRepro cmd:\n";
  - body += `
  - ./scripts/cti --tag ${env_vars.TEST_TAG} --suite land_blocking
  - `;
  - }
  + \`\`\`
  + ${env_vars.CTI_REPRO_CMD}
  + \`\`\`
  + `
  } catch (err) {
  if (err.code === 'ReferenceError') {
  console.error("One of the following env vars is not set: $TEST_COMPAT, $TEST_TAG, $PREV_TAG");
  