feat: adding version command to cli

Author: mxcd

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
           GOARCH: ${{ matrix.arch }}
         run: |
           cd cmd/gitops
-          go build -ldflags="-s -w" .
+          go build -ldflags="-s -w -X 'main.version=${{ github.ref_name }}'" .
       - name: Upload binaries to release
         uses: svenstaro/upload-release-action@v2
         with:
@@ -69,5 +69,7 @@ jobs:
         with:
           platforms: linux/amd64
           push: true
+          build-args: |
+            GITOPS_VERSION=${{ github.ref_name }}
           tags: ghcr.io/mxcd/gitops/${{ matrix.image }}:${{ github.ref_name }}
           file: docker/${{ matrix.image }}/Dockerfile

cmd/gitops/main.go

@@ -15,10 +15,19 @@ import (
 	"github.com/urfave/cli/v2"
 )
 
+var version = "development"
+
 func main() {
+	cli.VersionFlag = &cli.BoolFlag{
+		Name:    "version",
+		Aliases: []string{},
+		Usage:   "print only the version",
+	}
+
 	app := &cli.App{
-		Name:  "gitpos",
-		Usage: "GitOps CLI",
+		Name:    "gitpos",
+		Version: version,
+		Usage:   "GitOps CLI",
 		Flags: []cli.Flag{
 			&cli.StringFlag{
 				Name:    "root-dir",

docker/gitops/Dockerfile

@@ -1,6 +1,8 @@
 FROM golang:1.24-alpine3.20 AS builder
 RUN apk add --no-cache git
 
+ARG GITOPS_VERSION="development"
+
 WORKDIR /usr/src
 COPY go.mod /usr/src/go.mod
 COPY go.sum /usr/src/go.sum
@@ -10,7 +12,7 @@ COPY cmd cmd
 COPY internal internal
 
 WORKDIR /usr/src/cmd/gitops
-RUN go build -o gitops -ldflags="-s -w" .
+RUN go build -o gitops -ldflags="-s -w 'main.version=${GITOPS_VERSION}'" .
 
 FROM alpine:3.20
 WORKDIR /usr/bin