Making the python tolerant of multiple submissions of the same alg

src/test_certs_r3.sh

@@ -33,7 +33,7 @@ test_ta () {
     oid=${tafileBasename%_ta.pem}  # remove the suffix "_ta.pem"
 
     # some artifacts submit multiple copies of the same cert as .pem, .der, etc. Just skip the second one
-    if [[ $alreadyTestedOIDs == *$oid* ]]; then
+    if [[ $"alreadyTestedOIDs" =~ .*"$oid".* ]]; then
         printf "Warning: %s has been submitted multiple times by this provider. Skipping" $oid 
         return
     fi