fix: add labels

Dockerfile

@@ -1,17 +1,29 @@
-FROM docker.io/library/golang:1.21.6-alpine3.18
+FROM docker.io/library/golang:1.21.6-alpine3.18 as build
 
 ARG VERSION
 
 COPY ./ /workspace
 
-RUN cd /workspace && \
-    VERSION=${VERSION} \
-      make all
+WORKDIR /workspace
+
+RUN set -ex && \
+    apk update && \
+    apk add git make && \
+    make all VERSION=${VERSION}
 
 # TARGET
 # =====================================================================
 FROM docker.io/library/alpine:3.19
 
+ARG VERSION=latest
+
+LABEL org.opencontainers.image.authors="Markus Pesch" \
+      org.opencontainers.image.description="Return network interface names" \
+      org.opencontainers.image.documentation="https://git.cryptic.systems/volker.raschek/getidev#getidev" \
+      org.opencontainers.image.title="getidev" \
+      org.opencontainers.image.vendor="Markus Pesch" \
+      org.opencontainers.image.version="${VERSION}"
+
 COPY --from=build /workspace/getidev /usr/bin/getidev
 
 ENTRYPOINT [ "/usr/bin/getidev" ]