Enhance versionning on build packages (#165)

It was too challenging to only use "tags" without a prefix to trigger builds. So, the new rule is to prefix releases tags by "releases/"

Reviewed-on: #165

internal/generator/version.go

@@ -3,6 +3,7 @@ package generator
 import (
 	"regexp"
 	"runtime/debug"
+	"strings"
 )
 
 // Version is the version of katenary. It is set at compile time.
@@ -14,8 +15,15 @@ var Version = "master" // changed at compile time
 func GetVersion() string {
 	// try to get the semantic version from the Version variable (theorically set at compile time)
 	if reg := regexp.MustCompile(`^v?\d+.\d+.\d+.*|^release-.*`); reg.MatchString(Version) {
+		Version = strings.Replace(Version, "release-", "v", 1)
+		if Version[0] != 'v' {
+			Version = "v" + Version
+		}
 		return Version
 	}
+	if reg := regexp.MustCompile(`^releases/.*`); reg.MatchString(Version) {
+		return strings.Replace(Version, "releases/", "v", 1)
+	}
 
 	// OK... let's try to get the version from the build info
 	// get the version from the build info (when installed with go install)