Manages Splunk's cacert.pem so that custom certs can be added. Takes certs from the app's 'cert' directory and appends them to cacert.pem. To use this add-on to fix issues with the expiring Sectigo root certificate (only needed on Splunk versions older than 8), see the 'Fixing expiring Sectigo certificates on older versions of Splunk' section of README.md.