feat(cli-integ): speed up image pulls by logging into ECR public (#400)

Porting aws/aws-cdk-cli-testing#84

---
By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache-2.0 license

Co-authored-by: Rico Hermans <rix0rrr@gmail.com>
Co-authored-by: Momo Kornher <kornherm@amazon.co.uk>

Author: 3 people

packages/@aws-cdk-testing/cli-integ/lib/with-cdk-app.ts

@@ -50,6 +50,7 @@ export function withSpecificCdkApp(
       context.output,
       context.aws,
       context.randomString);
+    await fixture.ecrPublicLogin();
 
     let success = true;
     try {
@@ -123,6 +124,7 @@ export function withCdkMigrateApp(
       context.aws,
       context.randomString,
     );
+    await fixture.ecrPublicLogin();
 
     await ensureBootstrapped(fixture);
 

packages/@aws-cdk-testing/cli-integ/lib/with-cli-lib.ts

@@ -29,6 +29,7 @@ export function withCliLibIntegrationCdkApp<A extends TestContext & AwsContext &
       context.output,
       context.aws,
       context.randomString);
+    await fixture.ecrPublicLogin();
 
     let success = true;
     try {

packages/@aws-cdk-testing/cli-integ/lib/with-sam.ts

@@ -37,6 +37,7 @@ export function withSamIntegrationCdkApp<A extends TestContext & AwsContext>(blo
       context.output,
       context.aws,
       context.randomString);
+    await fixture.ecrPublicLogin();
 
     let success = true;
     try {