Grpc-web: Add grpwebproxy arm binaries to releases

[johanbrandhorst]

Following up from #387, we should add arm builds to the existing binaries in all future releases.

I used the following commands to build the v0.12.0 release:

$ GO111MODULE=off CGO_ENABLED=0 GOARM=5 GOARCH=arm go build -o grpcwebproxy-v0.12.0-arm5 ./go/grpcwebproxy/
$ GO111MODULE=off CGO_ENABLED=0 GOARM=6 GOARCH=arm go build -o grpcwebproxy-v0.12.0-arm6 ./go/grpcwebproxy/
$ GO111MODULE=off CGO_ENABLED=0 GOARM=7 GOARCH=arm go build -o grpcwebproxy-v0.12.0-arm7 ./go/grpcwebproxy/
$ GO111MODULE=off CGO_ENABLED=0 GOARCH=arm64 go build -o grpcwebproxy-v0.12.0-arm64 ./go/grpcwebproxy/

[pymenow]

Why did the 0.13 release not have the arm64 builds ?

[johanbrandhorst]

Ah, I believe they have to be built manually still, I can get that done.

[johanbrandhorst]

Done

[pymenow]

Perfect ! Thank you