how to generate pb file from proto files in ci/cd gitlab pipeline?

I am working on CI/CD pipeline (GitLab) build where I need to generate pb files from proto files over CI/CD pipeline.
So in order to install proto compiler all below ways
1.apt-get update && apt-get install -y protobuf-compiler
2. go get -u github.com/golang/protobuf/protoc-gen-go
But in both ways I am getting error below error.

protoc-gen-go: program not found or is not executable
Please specify a program using absolute path or make sure the program is available in your PATH system variable
--go_out: protoc-gen-go: Plugin failed with status code 1.

I think you need to install protoc in your CI/CD pipeline.

apt-get update
apt-get install -y protobuf-compiler
go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.2

Hit the below command to get env path

go env

Look for GOENV="{/path}". Copy the path and paste it inside {} below :-

export PATH="$PATH:${/path}"

CAVEAT: this is alternative thought to your question as it has already be answered and approved.

If your are generating Go files from .proto definitions, then it is common practice in Go to commit those to your repo so that they can be packaged up appropriately if you are building from your CI/CD or creating a module from the repo.

It seems like if you really don't want to commit those files, then you should have a good outlier use case to that end to explain it back.