OSBuild - add support for generic S3 services

jobimpl-osbuild
---------------
Add GenericS3Creds to struct
Add method to create AWS with Endpoint for Generic S3 (with its own credentials file)
Move uploading to S3 and result handling to a separate method (along with the special VMDK handling)
adjust the AWS S3 case to the new method
Implement a new case for uploading to a generic S3 service

awscloud
--------
Add wrapper methods for endpoint support
Set the endpoint to the AWS session
Set s3ForcePathStyle to true if endpoint was set

Target
------
Define a new target type for the GenericS3Target and Options
Handle unmarshaling of the target options and result for the Generic S3

Weldr
-----
Add support for only uploading to AWS S3
Define new structures for AWS S3 and Generic S3 (based on AWS S3)
Handle unmarshaling of the providers settings' upload settings

main
----
Add a section in the main config for the Generic S3 service for credentials
If provided pass the credentials file name to the osbuild job implementation

Upload Utility
--------------
Add upload-generic-s3 utility

Makefile
------
Do not fail if the bin directory already exists

Tests
-----
Add test cases for both AWS and a generic S3 server
Add a generic s3_test.sh file for both test cases and add it to the tests RPM spec
Adjust the libvirt test case script to support already created images
GitLabCI - Extend the libvirt test case to include the two new tests

internal/target/generic_s3_target.go

@@ -0,0 +1,20 @@
+package target
+
+type GenericS3TargetOptions struct {
+	AWSS3TargetOptions
+	Endpoint string `json:"endpoint"`
+}
+
+func (GenericS3TargetOptions) isTargetOptions() {}
+
+func NewGenericS3Target(options *GenericS3TargetOptions) *Target {
+	return newTarget("org.osbuild.generic.s3", options)
+}
+
+type GenericS3TargetResultOptions AWSS3TargetResultOptions
+
+func (GenericS3TargetResultOptions) isTargetResultOptions() {}
+
+func NewGenericS3TargetResult(options *GenericS3TargetResultOptions) *TargetResult {
+	return newTargetResult("org.osbuild.generic.s3", options)
+}

internal/target/target.go

@@ -83,6 +83,8 @@ func UnmarshalTargetOptions(targetName string, rawOptions json.RawMessage) (Targ
 		options = new(VMWareTargetOptions)
 	case "org.osbuild.oci":
 		options = new(OCITargetOptions)
+	case "org.osbuild.generic.s3":
+		options = new(GenericS3TargetOptions)
 	default:
 		return nil, errors.New("unexpected target name")
 	}

internal/target/targetresult.go

@@ -55,8 +55,10 @@ func UnmarshalTargetResultOptions(trName string, rawOptions json.RawMessage) (Ta
 		options = new(AzureImageTargetResultOptions)
 	case "org.osbuild.oci":
 		options = new(OCITargetResultOptions)
+	case "org.osbuild.generic.s3":
+		options = new(GenericS3TargetResultOptions)
 	default:
-		return nil, fmt.Errorf("Unexpected target result name: %s", trName)
+		return nil, fmt.Errorf("unexpected target result name: %s", trName)
 	}
 	err := json.Unmarshal(rawOptions, options)