Add code 502 to trigger restart

Added code 502 as an HTTP code to trigger restart.

This comes as part of a discussion where @crdeoliv suggested adding the code as it might help some instances in error state.

images/drupal-operations-scripts/probe-site.sh

@@ -32,8 +32,9 @@
 # 200: normally working base URL
 # 302: redirection (NOTE: not sure if there's a legitimate case to expect this)
 # 403: fully private websites give this response
+# 502: Bad gateway
 # 503: high load
-if [[ "${HTTP_CODE_BASE}" -eq "500" || "${HTTP_CODE_BASE}" -eq "503" ]]; then
+if [[ "${HTTP_CODE_BASE}" -eq "500" || "${HTTP_CODE_BASE}" -eq "502" || "${HTTP_CODE_BASE}" -eq "503" ]]; then
     echo "Probe failed" >> $FILE
     echo "Probe failed. Endpoint / responds with code: $HTTP_CODE_BASE"
     exit 1