feat: implement scheduled event for fetching available cars

- Add BUILD.bazel file for the `fetchAvailableCars` job
- Add main.go file for the `fetchAvailableCars` job
- Update serverless.yml to include `fetchAvailableCars` function with scheduled event

Signed-off-by: Sean Zheng <blackhorseya@gmail.com>

adapter/jobs/fetchAvailableCars/BUILD.bazel

@@ -0,0 +1,18 @@
+load("@rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "fetchAvailableCars_lib",
+    srcs = ["main.go"],
+    importpath = "github.com/blackhorseya/sion/adapter/jobs/fetchAvailableCars",
+    visibility = ["//visibility:private"],
+    deps = [
+        "@com_github_aws_aws_lambda_go//events",
+        "@com_github_aws_aws_lambda_go//lambda",
+    ],
+)
+
+go_binary(
+    name = "fetchAvailableCars",
+    embed = [":fetchAvailableCars_lib"],
+    visibility = ["//visibility:public"],
+)

adapter/jobs/fetchAvailableCars/main.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/aws/aws-lambda-go/lambda"
+)
+
+// Handler is our lambda handler invoked by the `lambda.Start` function call.
+func Handler(ctx context.Context, req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
+	return events.APIGatewayProxyResponse{
+		StatusCode: http.StatusOK,
+	}, nil
+}
+
+func main() {
+	lambda.Start(Handler)
+}

serverless.yml

@@ -33,3 +33,10 @@ functions:
       - http: ANY /{proxy+}
     environment: ${file(./deployments/${opt:stage, 'prod'}/.env.yaml)}
 
+  fetchAvailableCars:
+    handler: ./adapter/jobs/fetchAvailableCars/
+    name: ${sls:stage}-${self:service}-fetchAvailableCars
+    events:
+      - schedule: rate(1 minute)
+    environment: ${file(./deployments/${opt:stage, 'prod'}/.env.yaml)}
+