0.1.2-alma9 left $GOPATH/bin off PATH, so the package step's
`go install goreleaser` succeeded but `goreleaser` exited 127.
0.1.3-alma9 sets GOPATH=/go and PATH=/go/bin:$PATH.
golang:1.25/1.26 and the stale almalinux9-gobuilder pin are replaced by
gobuilder:0.1.2-alma9 on every step that invokes the Go toolchain, with
GOCACHEPROG wired to the baked-in go-cache-plugin against the shared
S3 cache bucket.
- build.yaml/test.yaml/release.yaml: build+test+goreleaser steps use
gobuilder, cache env added
- pre-commit.yaml: switch pin, add cache (hooks run go-fmt/go-vet/go-unit-tests)
- lint step (test.yaml) and upload-rpm step left untouched