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b495c905d5
<!-- Hi, thanks for contributing! Please make sure you read our CONTRIBUTING guide. Also, add tests and the respective documentation changes as well. --> Currently Goreleaser uses `runtime.NumCPU()` as the default value if `--parallelism` is not set. However, this will get the number of CPUs on the host even when Goreleaser is run in a container with a limit on the maximum number of CPUs that can be used (typically in a Kubernetes pod). Actually, `docker run --cpus=1 goreleaser/goreleaser --debug` shows `parallelism: 4` on my machine. This behavior causes CPU throttling, which increases execution time and, in the worst case, terminates with an error. I ran into this problem with Jenkins where the agent runs on pod ([Kubernetes plugin for Jenkins](https://plugins.jenkins.io/kubernetes/)). This commit introduces [automaxprocs](https://github.com/uber-go/automaxprocs) to fix this issue. This library sets `GOMAXPROCS` to match Linux container CPU quota. I have also looked for a library that can get CPU quota more directly, but this seems to be the best I could find. The reason it is set in a different notation from the automaxprocs README is to prevent logs from being displayed ([comment](https://github.com/uber-go/automaxprocs/issues/18#issuecomment-511330567)). I would have liked to write a test, but this change is dependent on the number of CPUs in the execution environment, so I could not. Instead, I wrote a Dockerfile for testing ```Dockerfile FROM golang:1.20.2 WORKDIR /go/app RUN sh -c "$(curl --location https://taskfile.dev/install.sh)" -- -d -b /usr/local/bin COPY . . RUN task build ``` and confirmed built binary shows expected parallelism by following commands: ```sh docker build --file Dockerfile.test . -t test-goreleaser docker run --cpus=1 test-goreleaser ./goreleaser build --snapshot --debug # parallelism: 1 docker run test-goreleaser ./goreleaser build --snapshot --debug # parallelism: 4 ``` I also ran the built binary on my Macbook and it was fine.