app/*/multiarch: return back empty value for TARGETARCH

follow-up after 91456ab5bb

docker buildx uses special variables, such as TARGETARCH and it shouldn't be overwritten.

 See this article for details
https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/

Signed-off-by: f41gh7 <nik@victoriametrics.com>

app/victoria-logs/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 9428
 ENTRYPOINT ["/victoria-logs-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY victoria-logs-linux-${TARGETARCH}-prod ./victoria-logs-prod

app/vmagent/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 8429
 ENTRYPOINT ["/vmagent-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmagent-linux-${TARGETARCH}-prod ./vmagent-prod

app/vmalert-tool/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 8429
 ENTRYPOINT ["/vmalert-tool-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmalert-tool-linux-${TARGETARCH}-prod ./vmalert-tool-prod

app/vmalert/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 8880
 ENTRYPOINT ["/vmalert-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmalert-linux-${TARGETARCH}-prod ./vmalert-prod

app/vmauth/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 8427
 ENTRYPOINT ["/vmauth-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmauth-linux-${TARGETARCH}-prod ./vmauth-prod

app/vmbackup/multiarch/Dockerfile

@@ -7,5 +7,5 @@ RUN apk update && apk upgrade && apk --update --no-cache add ca-certificates
 FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 ENTRYPOINT ["/vmbackup-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmbackup-linux-${TARGETARCH}-prod ./vmbackup-prod

app/vmctl/multiarch/Dockerfile

@@ -7,5 +7,5 @@ RUN apk update && apk upgrade && apk --update --no-cache add ca-certificates
 FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 ENTRYPOINT ["/vmctl-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmctl-linux-${TARGETARCH}-prod ./vmctl-prod

app/vminsert/multiarch/Dockerfile

@@ -6,7 +6,7 @@ RUN apk update && apk upgrade && apk --update --no-cache add ca-certificates
 
 FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-EXPOSE 8480
-ENTRYPOINT ["/vminsert-prod"]
-ARG TARGETARCH=non-existing
-COPY vminsert-linux-${TARGETARCH}-prod ./vminsert-prod
+EXPOSE 8428
+ENTRYPOINT ["/victoria-metrics-prod"]
+ARG TARGETARCH
+COPY victoria-metrics-linux-${TARGETARCH}-prod ./victoria-metrics-prod

app/vmrestore/multiarch/Dockerfile

@@ -7,5 +7,5 @@ RUN apk update && apk upgrade && apk --update --no-cache add ca-certificates
 FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 ENTRYPOINT ["/vmrestore-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmrestore-linux-${TARGETARCH}-prod ./vmrestore-prod

app/vmselect/multiarch/Dockerfile

@@ -8,5 +8,5 @@ FROM $root_image
 COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 EXPOSE 8481
 ENTRYPOINT ["/vmselect-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmselect-linux-${TARGETARCH}-prod ./vmselect-prod

app/vmstorage/multiarch/Dockerfile

@@ -10,5 +10,5 @@ EXPOSE 8482
 EXPOSE 8400
 EXPOSE 8401
 ENTRYPOINT ["/vmstorage-prod"]
-ARG TARGETARCH=non-existing
+ARG TARGETARCH
 COPY vmstorage-linux-${TARGETARCH}-prod ./vmstorage-prod