[local-preview] Failure with more specific information

Currently, When there is a failure at `checking_prerequisites` we don't actually propogate the issue resulting in confusion to the users. This PR updates the prettylog script to propogate the same as an error for the user to get more information Signed-off-by: Tarun Pothulapati <tarun@gitpod.io>

Author: Pothulapati

install/preview/entrypoint.sh

@@ -27,8 +27,6 @@ total_mem_kb=$(awk '/MemTotal:/ {print $2}' /proc/meminfo)
 if [ "${total_mem_kb}" -lt "${REQUIRED_MEM_KB}" ]; then
  echo "Gitpod local preview requires a system with at least 6GB of memory"
  exit 1
-else
- set -x
 fi
 
 REQUIRED_CORES=4

install/preview/prettylog/main.go

@@ -69,7 +69,8 @@ For more information about these limitation, please visit the local preview docu
 switch {
 case msg.Fail != "" && strings.Contains(line, msg.Fail):
 lastSpinner.Fail()
-next = true
+pterm.FgLightRed.Println("Failed with error: " + line)
+return
 case msg.Success != "" && strings.Contains(line, msg.Success):
 lastSpinner.Success()
 next = true