workflows: don't sign commit

So we can get newer git-buildpackage

.github/workflows/cd.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   cd:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
@@ -40,6 +40,6 @@ jobs:
           gbp import-ref -u "$version"
           gbp dch -D xenial -N "$version"-1
           git add debian/changelog
-          git commit -S -m "d/changelog: dch $version"
+          git commit -m "d/changelog: dch $version"
           gbp tag
           git push --tags origin master

pkg/utils/utils.go

@@ -102,8 +102,8 @@ func Loader() string {
 // ResolvePlaceholderString populates a template with values
 func ResolvePlaceholderString(str string, arguments map[string]string) string {
 	for key, value := range arguments {
-		str = strings.ReplaceAll(str, "{{"+key+"}}", value)
-		str = strings.ReplaceAll(str, "{{."+key+"}}", value)
+		str = strings.Replace(str, "{{"+key+"}}", value, -1)
+		str = strings.Replace(str, "{{."+key+"}}", value, -1)
 	}
 	return str
 }