Build loadimpact/k6 image from grafana/k6

Dockerfile

@@ -4,7 +4,9 @@ COPY . .
 RUN apk --no-cache add git=~2
 RUN CGO_ENABLED=0 go install -a -trimpath -ldflags "-s -w -X go.k6.io/k6/lib/consts.VersionDetails=$(date -u +"%FT%T%z")/$(git describe --tags --always --long --dirty)"
 
-FROM alpine:3.17
+# Runtime stage
+FROM alpine:3.17 as release
+
 # hadolint ignore=DL3018
 RUN apk add --no-cache ca-certificates && \
     adduser -D -u 12345 -g 12345 k6
@@ -13,3 +15,10 @@ COPY --from=builder /go/bin/k6 /usr/bin/k6
 USER 12345
 WORKDIR /home/k6
 ENTRYPOINT ["k6"]
+
+# Legacy loadimpact/k6 image
+FROM release
+
+COPY entrypoint-legacy.sh /usr/bin/
+
+ENTRYPOINT ["/usr/bin/entrypoint-legacy.sh"]