add version argument in dockerfile

deployment/ci/Dockerfile

@@ -4,9 +4,11 @@ RUN apk add git
 
 WORKDIR /go/src/gitlab.eclipse.org/eclipse/xfsc/tsa/signer
 
+ARG APP_REPO_TAG
+
 ADD . .
 
-RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-X main.Version=$(git describe --tags --always)" -mod=vendor -o /tmp/signer ./cmd/signer/...
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-X main.Version=$APP_REPO_TAG" -mod=vendor -o /tmp/signer ./cmd/signer/...
 
 FROM alpine:3.17 as runner