[docker] Add docker metadata

Dockerfile

@@ -19,4 +19,16 @@ FROM alpine:latest
 WORKDIR /app
 COPY --from=build-stage /build/pactester /app/
 
+# Metadata params
+ARG BUILD_DATE
+ARG VERSION
+ARG VCS_REF
+# Metadata
+LABEL org.label-schema.build-date=$BUILD_DATE \
+      org.label-schema.name="Pactester" \
+      org.label-schema.vcs-url="https://github.com/manugarg/pacparser" \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.label-schema.version=$VERSION \
+      com.microscaling.license="Apache-2.0"
+
 ENTRYPOINT ["/app/pactester"]