feat: Ec2Runner VPC selection

I just tried out to use the EC2 runners. Within our accounts we do not have a default VPC which leads to the stack can not be deployed.

const ec2Provider = new Ec2Runner(this, "ec2Runner", {
      subnet: subnets[0],
      spot: true,
    })

10:28:42 AM | CREATE_FAILED        | AWS::ImageBuilder::Image                       | Dev/GitHubRunners/...mage Builder/Image
Resource handler returned message: "Error occurred during operation 'No default VPC for this user. GroupName is only supported for EC2-Classic and default VPC.'." (RequestToken: ...., Handle
rErrorCode: GeneralServiceException)

Currently the Ec2RunnerProps also do not provide the option to set a VPC.

https://github.com/CloudSnorkel/cdk-github-runners/blob/main/src/providers/ec2.ts#L126-L186

[fwerkmeister]

After doing some more analysis it looks like the problem is related to the AmiBuilder where subnet and vpc would need to be passed into as properties if set.

https://github.com/CloudSnorkel/cdk-github-runners/blob/2aae0e6286cda81fb809aa3e02287767e29a6d28/src/providers/ec2.ts#L233

https://github.com/CloudSnorkel/cdk-github-runners/blob/main/src/providers/image-builders/ami.ts#L55-L74

[kichik]

I’ll create a PR. No need for a new issue.

BTW, I appreciate the bug reports, but you know you can pass your own image builder to get unblocked, right?

    const ec2Provider = new Ec2Runner(this, "ec2Runner", {
      subnet: subnets[0],
      spot: true,
      amiBuilder: new AmiBuilder(this, 'Image Builder', {
        vpc: vpc,
        subnetSelection: vpc.selectSubnets({subnetType: SubnetType.PUBLIC}),
        securityGroup: sg,
      }),
    })