specifically mark the code from flyctl, mention the license

README.md

@@ -23,6 +23,11 @@ We won't be building binaries ourselves either, the will be done by [goreleaser]
 Be sure to have it [installed](https://goreleaser.com/quick-start/), also [generate](https://github.com/settings/tokens/new?scopes=repo,write:packages) a github token and put it
 in `GITHUB_TOKEN` variable
 
+## Inspiration
+
+The code is inspired a lot and uses parts of the [flyctl](https://github.com/superfly/flyctl) code. The files
+with the borrowings mention this explicitly.
+
 ## License
 
 MIT

generated/buildinfo/buildinfo.go

@@ -12,6 +12,9 @@ import (
 	"github.com/pkg/errors"
 )
 
+// The code has been borrowed from flyctl project - https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/buildinfo
+// This code in the file is subject to Apache-2.0 license as per flyctl project
+
 var (
 	// set during init
 	cachedVersion   version.Version

generated/buildinfo/env_dev.go

@@ -8,6 +8,9 @@ import (
 	"github.com/can3p/kleiner/shared/version"
 )
 
+// The code has been borrowed from flyctl project - https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/buildinfo
+// This code in the file is subject to Apache-2.0 license as per flyctl project
+
 var (
 	buildDate   = "<date>"
 	environment = "development"

generated/buildinfo/env_production.go

@@ -8,6 +8,9 @@ import (
 	"github.com/can3p/kleiner/shared/version"
 )
 
+// The code has been borrowed from flyctl project - https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/buildinfo
+// This code in the file is subject to Apache-2.0 license as per flyctl project
+
 var (
 	buildDate    = "<date>"
 	buildVersion = "<version>"

shared/types/types.go

@@ -7,6 +7,9 @@ import (
 	"github.com/can3p/kleiner/shared/version"
 )
 
+// The struct has been borrowed from flyctl project - https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/buildinfo/buildinfo.go
+// This code in the file is subject to Apache-2.0 license as per flyctl project
+
 type BuildInfo struct {
 	Name         string
 	Version      version.Version

shared/version/version.go

@@ -9,6 +9,7 @@ import (
 )
 
 // From https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/version/version.go
+// This code is subject to Apache-2.0 license as per flyctl project
 
 type InvalidVersionError struct {
 	val     string

shared/version/version_test.go

@@ -1,6 +1,7 @@
 package version
 
 // from https://github.com/superfly/flyctl/blob/0dff860a878e2b280f2f53ce2aaf21ce39d800c2/internal/version/version_test.go
+// This code is subject to Apache-2.0 license as per flyctl project
 
 import (
 	"encoding/json"