stkAtom price feed (#9394)

closes: #9393

## Description

Add a new priceFeed for StkATOM.

### Security Considerations

None

### Scaling Considerations

None

### Documentation Considerations

None

### Testing Considerations

[**Edited**]: added verification to an existing test in A3P.

### Upgrade Considerations

This completes the sustainability upgrade by replacing the only
priceFeed that wasn't handled in the A3P tests.

a3p-integration/proposals/a:upgrade-next/upgradeVaults.test.js

@@ -36,6 +36,7 @@ const checkPriceFeedVatsUpdated = async t => {
     checkForOracle(t, 'stATOM'),
     checkForOracle(t, 'stTIA'),
     checkForOracle(t, 'stOSMO'),
+    checkForOracle(t, 'stkATOM'),
   ]);
 };
 
@@ -51,12 +52,14 @@ const tryPushPrices = async t => {
   await addOraclesForBrand('stATOM', oraclesByBrand);
   await addOraclesForBrand('stTIA', oraclesByBrand);
   await addOraclesForBrand('stOSMO', oraclesByBrand);
+  await addOraclesForBrand('stkATOM', oraclesByBrand);
 
   t.log('pushing new prices');
   await pushPrices(11.2, 'ATOM', oraclesByBrand);
   await pushPrices(11.3, 'stTIA', oraclesByBrand);
   await pushPrices(11.4, 'stATOM', oraclesByBrand);
   await pushPrices(11.5, 'stOSMO', oraclesByBrand);
+  await pushPrices(11.6, 'stkATOM', oraclesByBrand);
 
   t.log('awaiting new quotes');
   const atomOut = await getPriceQuote('ATOM');
@@ -67,6 +70,8 @@ const tryPushPrices = async t => {
   t.is(stAtomOut, '+11400000');
   const osmoOut = await getPriceQuote('stOSMO');
   t.is(osmoOut, '+11500000');
+  const stkAtomOut = await getPriceQuote('stkATOM');
+  t.is(stkAtomOut, '+11600000');
 };
 
 const createNewBid = async t => {

golang/cosmos/app/app.go

@@ -913,6 +913,7 @@ func unreleasedUpgradeHandler(app *GaiaApp, targetUpgrade string) func(sdk.Conte
 					"@agoric/builders/scripts/vats/updateStAtomPriceFeed.js",
 					"@agoric/builders/scripts/vats/updateStOsmoPriceFeed.js",
 					"@agoric/builders/scripts/vats/updateStTiaPriceFeed.js",
+					"@agoric/builders/scripts/vats/updateStkAtomPriceFeed.js",
 				),
 				// Add new auction contract. The old one will be retired shortly.
 				vm.CoreProposalStepForModules( "@agoric/builders/scripts/vats/add-auction.js"),

packages/builders/scripts/vats/updateStkAtomPriceFeed.js

@@ -0,0 +1,21 @@
+import { makeHelpers } from '@agoric/deploy-script-support';
+import { priceFeedProposalBuilder } from './priceFeedSupport.js';
+
+const OPTIONS = {
+  AGORIC_INSTANCE_NAME: 'stkATOM-USD price feed',
+  IN_BRAND_LOOKUP: ['agoricNames', 'oracleBrand', 'stkAtom'],
+  OUT_BRAND_LOOKUP: ['agoricNames', 'oracleBrand', 'USD'],
+};
+
+/**
+ * @type {import('@agoric/deploy-script-support/src/externalTypes.js').ProposalBuilder}
+ */
+export const defaultProposalBuilder = async ({ publishRef, install }) => {
+  return priceFeedProposalBuilder({ publishRef, install }, OPTIONS);
+};
+
+export default async (homeP, endowments) => {
+  const { writeCoreProposal } = await makeHelpers(homeP, endowments);
+
+  await writeCoreProposal('stkATOMPriceFeed', defaultProposalBuilder);
+};