Tolerate https scheme & update docs

[kylos101]

Description

Tolerate users encountering with scheme or not, but only support https scheme (ignore others).

Also, updated the documentation after testing in a private cell that was built using our latest infrastructure (where we limit the VPC endpoints). Otherwise gitpod-network-check will fail.

Related Issue(s)

Fixes ENT-630

How to test

1. Test with unsupported schemes

go run . diagnose
INFO[0000] ✅ Main Subnets are valid                     
INFO[0000] ✅ Pod Subnets are valid                      
INFO[0000] ℹ️  Checking prerequisites                   
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ec2messages is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssm is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssmmessages is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.execute-api is configured 
INFO[0000] ✅ IAM role created and policy attached       
INFO[0001] ℹ️  Launching EC2 instances in Main subnets  
INFO[0001] ℹ️  Created security group with ID: sg-0fbbf79f1d4749ece 
INFO[0008] ℹ️  Created security group with ID: sg-09cf8f40133a248b7 
INFO[0010] ℹ️  Main EC2 instances: [i-045e426b72b43d9f0 i-0ec28f9c96ca805ce] 
INFO[0010] ℹ️  Launching EC2 instances in a Pod subnets 
INFO[0010] ℹ️  Created security group with ID: sg-07991bf2e32482c40 
INFO[0013] ℹ️  Created security group with ID: sg-09f06096305c1d743 
INFO[0015] ℹ️  Pod EC2 instances: [i-0c24d97271ebf7783 i-034e332706fbfe246] 
INFO[0015] ℹ️  Waiting for EC2 instances to become ready (can take up to 2 minutes) 
INFO[0047] ✅ EC2 Instances are now running successfully 
INFO[0047] ℹ️  Connecting to SSM...                     
INFO[0123] ℹ️  Checking if the required AWS Services can be reached from the ec2 instances 
INFO[0124] ✅ Autoscaling is available                   
INFO[0125] ✅ CloudFormation is available                
INFO[0126] ✅ CloudWatch is available                    
INFO[0127] ✅ EC2 is available                           
INFO[0128] ✅ EC2messages is available                   
INFO[0130] ✅ ECR is available                           
INFO[0130] ✅ ECR Api is available                       
INFO[0131] ✅ EKS is available                           
INFO[0132] ✅ Elastic LoadBalancing is available         
INFO[0134] ✅ KMS is available                           
INFO[0135] ✅ Kinesis Firehose is available              
INFO[0136] ✅ SSM is available                           
INFO[0137] ✅ SSMmessages is available                   
INFO[0138] ✅ SecretsManager is available                
INFO[0139] ✅ Sts is available                           
INFO[0139] ℹ️  Checking if certain AWS Services can be reached from ec2 instances in the main subnet 
INFO[0140] ✅ DynamoDB is available                      
INFO[0142] ✅ S3 is available                            
WARN[0142] 🚧 Unsupported scheme: httpx, skipping test for  httpx://gitpod.io 
WARN[0142] 🚧 Unsupported scheme: http, skipping test for  http://aol.com 
INFO[0142] ℹ️  Checking if hosts can be reached with HTTPS from ec2 instances in the main subnets 
INFO[0143] ✅ accounts.google.com is available           
INFO[0144] ✅ github.com is available                    
INFO[0145] ✅ https://okta.com is available              
INFO[0145] ✅ Instances terminated                       
INFO[0145] Cleaning up: Waiting for 2 minutes so network interfaces are deleted 
INFO[0266] ✅ Role 'GitpodNetworkCheck' deleted          
INFO[0266] ✅ Instance profile deleted                   
INFO[0267] ✅ Security group 'sg-0fbbf79f1d4749ece' deleted 
INFO[0267] ✅ Security group 'sg-09cf8f40133a248b7' deleted 
INFO[0267] ✅ Security group 'sg-07991bf2e32482c40' deleted 
INFO[0267] ✅ Security group 'sg-09f06096305c1d743' deleted 

2. Test with supported schemes only

go run . diagnose
INFO[0000] ✅ Main Subnets are valid                     
INFO[0000] ✅ Pod Subnets are valid                      
INFO[0000] ℹ️  Checking prerequisites                   
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ec2messages is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssm is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssmmessages is configured 
INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.execute-api is configured 
INFO[0000] ✅ IAM role created and policy attached       
INFO[0001] ℹ️  Launching EC2 instances in Main subnets  
INFO[0001] ℹ️  Created security group with ID: sg-0306785da84886870 
INFO[0007] ℹ️  Created security group with ID: sg-0799a09b016272637 
INFO[0009] ℹ️  Main EC2 instances: [i-062a3b4b79864ae3c i-0f22ea05add71fd21] 
INFO[0009] ℹ️  Launching EC2 instances in a Pod subnets 
INFO[0010] ℹ️  Created security group with ID: sg-0bd7cb9de2b5bbed8 
INFO[0012] ℹ️  Created security group with ID: sg-0246627980b8b50e5 
INFO[0014] ℹ️  Pod EC2 instances: [i-0532caaae32e9c615 i-0ed8eedf443da1281] 
INFO[0014] ℹ️  Waiting for EC2 instances to become ready (can take up to 2 minutes) 
INFO[0043] ✅ EC2 Instances are now running successfully 
INFO[0043] ℹ️  Connecting to SSM...                     
INFO[0117] ℹ️  Checking if the required AWS Services can be reached from the ec2 instances 
INFO[0118] ✅ Autoscaling is available                   
INFO[0119] ✅ CloudFormation is available                
INFO[0120] ✅ CloudWatch is available                    
INFO[0122] ✅ EC2 is available                           
INFO[0123] ✅ EC2messages is available                   
INFO[0124] ✅ ECR is available                           
INFO[0125] ✅ ECR Api is available                       
INFO[0126] ✅ EKS is available                           
INFO[0127] ✅ Elastic LoadBalancing is available         
INFO[0128] ✅ KMS is available                           
INFO[0130] ✅ Kinesis Firehose is available              
INFO[0131] ✅ SSM is available                           
INFO[0132] ✅ SSMmessages is available                   
INFO[0133] ✅ SecretsManager is available                
INFO[0134] ✅ Sts is available                           
INFO[0134] ℹ️  Checking if certain AWS Services can be reached from ec2 instances in the main subnet 
INFO[0135] ✅ DynamoDB is available                      
INFO[0136] ✅ S3 is available                            
INFO[0136] ℹ️  Checking if hosts can be reached with HTTPS from ec2 instances in the main subnets 
INFO[0137] ✅ accounts.google.com is available           
INFO[0139] ✅ https://github.com is available            
INFO[0139] ✅ Instances terminated                       
INFO[0139] Cleaning up: Waiting for 2 minutes so network interfaces are deleted 
INFO[0260] ✅ Role 'GitpodNetworkCheck' deleted          
INFO[0260] ✅ Instance profile deleted                   
INFO[0260] ✅ Security group 'sg-0306785da84886870' deleted 
INFO[0261] ✅ Security group 'sg-0799a09b016272637' deleted 
INFO[0261] ✅ Security group 'sg-0bd7cb9de2b5bbed8' deleted 
INFO[0261] ✅ Security group 'sg-0246627980b8b50e5' deleted 

Documentation

/hold