fix #121 and #123 - add support for reading env variables from .env (#133)

cmd/input.go

@@ -17,6 +17,7 @@ type Input struct {
 	dryrun          bool
 	forcePull       bool
 	noOutput        bool
+	envfile         string
 }
 
 func (i *Input) resolve(path string) string {
@@ -33,6 +34,11 @@ func (i *Input) resolve(path string) string {
 	return path
 }
 
+// Envfile returns path to .env
+func (i *Input) Envfile() string {
+	return i.resolve(i.envfile)
+}
+
 // Workdir returns path to workdir
 func (i *Input) Workdir() string {
 	return i.resolve(".")