Push Mend scan results for main branch only

[leochr]

The Mend scan results from personal builds are being pushed to the central Mend dashboard we monitor. Only the results from the main branch should be pushed to the dashboard.

The compliance check stage runs the Mend scanner, but since the Operator code is not 'built' at that time, it doesn't identify the open-source packages. So we enabled the scan in the containerize stage by executing the mend script and this populates the expected packages.

Options:

• Skip the scanner in the compliance check stage (altogether preferably or scan main branch only). Add a check to containerize stage to scan main branch only.
  OR
• Remove the scanner in containerize stage. 'Build' Operator before the scanner runs in compliance check stage, so that it can identify the packages. Scan main branch only.