Add context.transaction for interactive Prisma transactions when u…

…sing a Keystone `context` (#9122)

.changeset/add-transactions.md

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+---
+'@keystone-6/core': minor
+---
+
+Adds `context.transaction` for interactive transactions when using a `context`

examples/transactions/keystone.ts

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+import { config } from '@keystone-6/core'
+import { fixPrismaPath } from '../example-utils'
+import { lists, extendGraphqlSchema } from './schema'
+
+export default config({
+  db: {
+    provider: 'sqlite',
+    url: process.env.DATABASE_URL ?? 'file:./keystone-example.db',
+    enableLogging: ['query', 'info', 'warn', 'error'],
+
+    // WARNING: this is only needed for our monorepo examples, don't do this
+    ...fixPrismaPath,
+  },
+  lists,
+  graphql: {
+    extendGraphqlSchema,
+  }
+})

examples/transactions/package.json

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+{
+  "name": "@keystone-6/example-transactions",
+  "private": true,
+  "license": "MIT",
+  "scripts": {
+    "dev": "keystone dev",
+    "start": "keystone start",
+    "build": "keystone build",
+    "postinstall": "keystone postinstall"
+  },
+  "dependencies": {
+    "@keystone-6/core": "workspace:^",
+    "@prisma/client": "^5.0.0"
+  },
+  "devDependencies": {
+    "prisma": "^5.0.0",
+    "typescript": "~5.0.0"
+  }
+}

examples/transactions/sandbox.config.json

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+{
+  "template": "node",
+  "container": {
+    "startScript": "keystone dev",
+    "node": "16"
+  }
+}