func (c EnvvarCollection) GetAll(name string) EnvvarCollection {
	ec := make(EnvvarCollection, 0)
	for _, ev := range c {
		if ev.Name == name {
			ec = append(ec, ev)
		}
	}
	return ec
}
GetAll returns all Envvar that has name.
package envvars
type EnvvarCollection []*Envvar
func (c EnvvarCollection) WithTag(name string) EnvvarCollection {
	taggedEvs := make(EnvvarCollection, 0, len(c))
	for _, ev := range c {
		if ev.HasTag(name) {
			taggedEvs = append(taggedEvs, ev)
		}
	}
	return taggedEvs
}
func (c EnvvarCollection) Get(name string) *Envvar {
	for _, ev := range c {
		if ev.Name == name {
			return ev
		}
	}
	return nil
}