feat(core): add render preset (#239)

Co-authored-by: Julius Marminge <julius0216@outlook.com>

.changeset/shiny-frogs-sneeze.md

@@ -0,0 +1,5 @@
+---
+"@t3-oss/env-core": minor
+---
+
+add render preset

docs/src/app/docs/customization/page.mdx

@@ -98,6 +98,7 @@ T3 Env ships the following presets out of the box, all importable from the `/pre
 
 - `vercel` - Vercel environment variables. See full list [here](https://vercel.com/docs/projects/environment-variables/system-environment-variables#system-environment-variables).
 - `uploadthing` - All environment variables required to use [UploadThing](https://uploadthing.com/). More info [here](https://docs.uploadthing.com/getting-started/appdir#add-env-variables).
+- `render` - Render environment variables. See full list [here](https://docs.render.com/environment-variables#all-runtimes).
 
 <Callout type="info">
 

packages/core/src/presets.ts

@@ -41,3 +41,28 @@ export const uploadthing = () =>
     },
     runtimeEnv: process.env,
   });
+
+/**
+ * Render System Environment Variables
+ * @see https://docs.render.com/environment-variables#all-runtimes
+ */
+export const render = () =>
+  createEnv({
+    server: {
+      IS_PULL_REQUEST: z.string().optional(),
+      RENDER_DISCOVERY_SERVICE: z.string().optional(),
+      RENDER_EXTERNAL_HOSTNAME: z.string().optional(),
+      RENDER_EXTERNAL_URL: z.string().url().optional(),
+      RENDER_GIT_BRANCH: z.string().optional(),
+      RENDER_GIT_COMMIT: z.string().optional(),
+      RENDER_GIT_REPO_SLUG: z.string().optional(),
+      RENDER_INSTANCE_ID: z.string().optional(),
+      RENDER_SERVICE_ID: z.string().optional(),
+      RENDER_SERVICE_NAME: z.string().optional(),
+      RENDER_SERVICE_TYPE: z
+        .enum(["web", "pserv", "cron", "worker", "static"])
+        .optional(),
+      RENDER: z.string().optional(),
+    },
+    runtimeEnv: process.env,
+  });