Passing on accounts without a minimum of equity

My liquidator was getting stuck on a loop with accounts with 0
equity but that were reported as negative health. This will also
help avoiding accounts that you don't consider worth the opportunity
cost.

src/liquidator.ts

@@ -65,6 +65,13 @@ const groupIds = config.getGroup(cluster, groupName) ?? (() => { throw new Error
 const TARGETS = process.env.TARGETS?.replace(/\s+/g,' ').trim().split(' ').map((s) => parseFloat(s))
   ?? [0, 0, 0, 0, 0, 0, 0, 0, 0];
 
+// Do not liquidate accounts that have less than this much in value
+const minEquity = parseInt(
+  process.env.MIN_EQUITY || '5',
+);
+console.log(`Minimum equity required to bother: ${minEquity}`);
+
+
 const mangoProgramId = groupIds.mangoProgramId;
 const mangoGroupKey = groupIds.publicKey;
 
@@ -276,6 +283,13 @@ async function maybeLiquidateAccount(mangoAccount: MangoAccount): Promise<boolea
       return false;
     }
 
+    const equity = mangoAccount.computeValue(mangoGroup, cache).toNumber()
+    if (equity < minEquity) {
+      // console.log(`Account ${mangoAccountKeyString} only has ${equity}, PASS`);
+      return false;
+    }
+
+
     const health = mangoAccount.getHealthRatio(mangoGroup, cache, 'Maint');
     const accountInfoString = mangoAccount.toPrettyString(
       groupIds,