refs #23 Define version build-arg and pass it during docker image build

.github/workflows/docker.yaml

@@ -40,3 +40,5 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            CI_COMMIT_REF_NAME=${{ env.tag }}

Dockerfile

@@ -3,6 +3,9 @@ FROM golang:latest as builder
 
 LABEL maintainer="Òscar Casajuana <elboletaire@underave.net>"
 
+ARG CI_COMMIT_REF_NAME
+ENV CI_COMMIT_REF_NAME ${CI_COMMIT_REF_NAME:-latest}
+
 WORKDIR /app
 
 COPY go.mod go.sum ./

cmd/root.go

@@ -220,7 +220,8 @@ func init() {
 	rootCmd.Flags().Uint8VarP(&settings.MaxConcurrency.Pages, "concurrency-pages", "C", 10, "number of concurrent page downloads, hard-limited to 10")
 	rootCmd.Flags().StringVarP(&settings.Language, "language", "l", "", "only download the specified language")
 	rootCmd.Flags().StringVarP(&settings.FilenameTemplate, "filename-template", "t", packer.FilenameTemplateDefault, "template for the resulting filename")
-	rootCmd.Flags().StringVarP(&settings.OutputDir, "output-dir", "o", "./", "output directory for the downloaded files")
+	// set as persistent, so version command does not complain about the -o flag set via docker
+	rootCmd.PersistentFlags().StringVarP(&settings.OutputDir, "output-dir", "o", "./", "output directory for the downloaded files")
 }
 
 func cerr(err error, prefix string) {