Allow building docker manifests having empty template values #5824
Description
Discussed in https://github.com/orgs/goreleaser/discussions/5822
Originally posted by zerospiel June 10, 2025
Hi all,
I am trying to build a new configuration for my CI, and I'd like to keep everything within a single config file instead of producing boilerplates. Having that said, I am struggling to implement something close to a conditional expression within the docker_manifests package section, having the following (simplified/trimmed) .goreleaser.yaml:
builds:
- id: amd64
env:
- CGO_ENABLED=0
- GO111MODULE=on
goos:
- linux
goarch:
- amd64
- id: arm_and_arm64
env:
- CGO_ENABLED=0
- GO111MODULE=on
goos:
- linux
goarch:
- arm
- arm64
goarm:
- "7"
builder: go
# Here is the conditional skip
skip: >-
{{ if isEnvSet "SKIP_ARM" }}{{ true }}{{ else }}false{{ end }}
dockers:
- id: linux-amd64
goos: linux
goarch: amd64
image_templates:
- "{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}-amd64"
skip_push: false
dockerfile: "goreleaser.dockerfile"
use: buildx
ids:
- amd64
build_flag_templates:
- --platform=linux/amd64
- id: linux-arm64
goos: linux
goarch: arm64
image_templates:
- "{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}-arm64v8"
skip_push: false
dockerfile: "goreleaser.dockerfile"
use: buildx
ids:
- arm_and_arm64
build_flag_templates:
- --platform=linux/arm64/v8
docker_manifests:
- name_template: '{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}'
image_templates:
- '{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}-amd64'
# Here is my attempt to skip these images from being added to the manifest
- >-
{{ if isEnvSet "SKIP_ARM" }}{{""}}{{ else }}{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}-arm64v8{{ end }}
- >-
{{ if isEnvSet "SKIP_ARM" }}{{""}}{{ else }}{{ .Env.REGISTRY }}/{{ .Env.IMAGE_NAME }}:{{ .Version }}-armv7{{ end }}
skip_push: false
use: dockerSo, here at the last lines, I have a list with ifs, what I want to achieve is to skip creating a manifest from non-existent digests (because the images from dockers will be skipped due to set ids section, which is done on purpose), but unfortunately, the current implementation does not skip empty image names after evaluating a template name.
Hence, my question is: am I doing it wrong, or is it worth adding an extra if statement to the line of code mentioned above?
Would appreciate any tips!