feat: Checkly app connection and secrets sync (#4078)

* feat: checkly app connection
---------
Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

backend/src/services/app-connection/checkly/checkly-connection-schemas.ts

@@ -0,0 +1,62 @@
+import z from "zod";
+
+import { AppConnections } from "@app/lib/api-docs";
+import { AppConnection } from "@app/services/app-connection/app-connection-enums";
+import {
+  BaseAppConnectionSchema,
+  GenericCreateAppConnectionFieldsSchema,
+  GenericUpdateAppConnectionFieldsSchema
+} from "@app/services/app-connection/app-connection-schemas";
+
+import { ChecklyConnectionMethod } from "./checkly-connection-constants";
+
+export const ChecklyConnectionMethodSchema = z
+  .nativeEnum(ChecklyConnectionMethod)
+  .describe(AppConnections.CREATE(AppConnection.Checkly).method);
+
+export const ChecklyConnectionAccessTokenCredentialsSchema = z.object({
+  apiKey: z.string().trim().min(1, "API Key required").max(255).describe(AppConnections.CREDENTIALS.CHECKLY.apiKey)
+});
+
+const BaseChecklyConnectionSchema = BaseAppConnectionSchema.extend({
+  app: z.literal(AppConnection.Checkly)
+});
+
+export const ChecklyConnectionSchema = BaseChecklyConnectionSchema.extend({
+  method: ChecklyConnectionMethodSchema,
+  credentials: ChecklyConnectionAccessTokenCredentialsSchema
+});
+
+export const SanitizedChecklyConnectionSchema = z.discriminatedUnion("method", [
+  BaseChecklyConnectionSchema.extend({
+    method: ChecklyConnectionMethodSchema,
+    credentials: ChecklyConnectionAccessTokenCredentialsSchema.pick({})
+  })
+]);
+
+export const ValidateChecklyConnectionCredentialsSchema = z.discriminatedUnion("method", [
+  z.object({
+    method: ChecklyConnectionMethodSchema,
+    credentials: ChecklyConnectionAccessTokenCredentialsSchema.describe(
+      AppConnections.CREATE(AppConnection.Checkly).credentials
+    )
+  })
+]);
+
+export const CreateChecklyConnectionSchema = ValidateChecklyConnectionCredentialsSchema.and(
+  GenericCreateAppConnectionFieldsSchema(AppConnection.Checkly)
+);
+
+export const UpdateChecklyConnectionSchema = z
+  .object({
+    credentials: ChecklyConnectionAccessTokenCredentialsSchema.optional().describe(
+      AppConnections.UPDATE(AppConnection.Checkly).credentials
+    )
+  })
+  .and(GenericUpdateAppConnectionFieldsSchema(AppConnection.Checkly));
+
+export const ChecklyConnectionListItemSchema = z.object({
+  name: z.literal("Checkly"),
+  app: z.literal(AppConnection.Checkly),
+  methods: z.nativeEnum(ChecklyConnectionMethod).array()
+});