Do not rename asset/main

The pull request I copied to create this pull request renamed
the handler, however the Go source is still named main.go, so
we should keep the main naming.

lambda/Dockerfile

@@ -35,6 +35,6 @@ RUN go env
 COPY . /ws
 
 RUN mkdir -p /asset/ && \
-    make OUTPUT=/asset/bootstrap && \
-    file /asset/bootstrap && \
-    ls -lh /asset/bootstrap
+    make OUTPUT=/asset/main && \
+    file /asset/main && \
+    ls -lh /asset/main

src/index.ts

@@ -141,7 +141,7 @@ export class ECRDeployment extends Construct {
       uuid: this.renderSingletonUuid(memoryLimit),
       code: getCode(props.buildImage ?? 'public.ecr.aws/sam/build-go1.x:latest'),
       runtime: lambda.Runtime.PROVIDED_AL2,
-      handler: 'bootstrap',
+      handler: 'main',
       environment: props.environment,
       lambdaPurpose: 'Custom::CDKECRDeployment',
       timeout: Duration.minutes(15),