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container-gobuilder/README.md
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Add matrixed gobuilder image build
Replace the packer-images gobuilder with a Dockerfile matrix built on each
container-base distro image, on a single repo semver.

- install golang, gcc and nfpm
- bake the sha256-pinned go-cache-plugin v0.1.0 binary onto PATH
- run in-image assertions as a --target test build stage
- add pull_request build/test/pre-commit and tag-triggered docker workflows
2026-09-27 17:55:29 +10:00

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# container-gobuilder
The estate's Go toolchain image, built on each `container-base` distro image.
Published as `artifactapi.k8s.syd1.au.unkin.net/docker-internal/gobuilder:<version>-<suffix>`;
the default distro also gets the unsuffixed `:<version>` and `:latest`.
| distro | from | tag suffix | default |
| --- | --- | --- | --- |
| `alma9` | `docker-internal/almalinux9:<base version>` | `alma9` | yes |
Adds `golang`, `gcc` and `nfpm`, and bakes in the `go-cache-plugin` binary on `PATH`
so Go pipelines get the shared build cache with no download step. No credentials and no
`GOCACHEPROG` value are baked in — consumers set those.
The `container-base` release this image builds on is `BASE_VERSION` in the `Dockerfile`.
## Adding a distro
1. `distros/<name>/distro.env` — `BASE_IMAGE_NAME`, `IMAGE`, `TAG_SUFFIX`, `DEFAULT`, `PACKAGES`, `GO_MIN`.
2. One `include` entry in each of `.woodpecker/{build,test,docker}.yaml`.
`pre-commit.sh` fails if step 2 is forgotten, or if more than one distro claims `DEFAULT`.
## Make
make build # build every distro
make test # build the test stage of every distro (assertions run in-image)
make build-alma9 # one distro
make patch|minor|major