Fix error obtaining VCS status: exit status 128 at docker build

How to replicate the error: `make docker`

Previous error:
```
... long log
 ---> f394d136bb6c
Step 7/24 : ADD proto/go.sum proto/go.sum
 ---> 7fca7e520cb3
Step 8/24 : ENV CGO_ENABLED 1
 ---> Running in ca87bf346155
Removing intermediate container ca87bf346155
 ---> af2dbef0c762
Step 9/24 : RUN go mod download
 ---> Running in 98785997fa9c
Removing intermediate container 98785997fa9c
 ---> f74577fb6d14
Step 10/24 : ADD . .
 ---> f1cc0ac767f0
Step 11/24 : RUN go build -tags sqlite -o /usr/bin/keto .
 ---> Running in 913258959d81
error obtaining VCS status: exit status 128
	Use -buildvcs=false to disable VCS stamping.
The command '/bin/sh -c go build -tags sqlite -o /usr/bin/keto .'
returned a non-zero code: 1
```

This is fixed by setting -buildvcs=false

ref: golang/go#49004

.docker/Dockerfile-build

@@ -16,7 +16,7 @@ RUN go mod download
 
 ADD . .
 
-RUN go build -tags sqlite -o /usr/bin/keto .
+RUN go build -buildvcs=false -tags sqlite -o /usr/bin/keto .
 
 FROM alpine:3.16