Allow to configure platforms for the built container image

README.md

@@ -411,12 +411,14 @@ If `enabled` is set to true, the generated `Dockerfile` is built for the platfor
 ```yaml
 pushContainerToGhcr:
   enabled: true
+  platforms: "linux/amd64,linux/arm64"
   tagStrategy:
     - edge
     - latest
     - semver
 ```
 
+`platforms` configures for which platforms the multi-arch docker image is built. Defaults to `linux/amd64`. Note: emulation is provided by qemu and might take significant time.
 `tagStrategy` influences which container tags will be pushed. Currently `edge`, `latest` and `semver` are supported.
 
 ### `githubWorkflow.release`

internal/core/config.go

@@ -150,6 +150,7 @@ type LicenseWorkflowConfig struct {
 
 type PushContainerToGhcrConfig struct {
 	Enabled     bool     `yaml:"enabled"`
+	Platforms   string   `yaml:"platforms"`
 	TagStrategy []string `yaml:"tagStrategy"`
 }
 

internal/ghworkflow/workflow_ghcr.go

@@ -106,6 +106,11 @@ type=semver,pattern=v{{major}}
 		Name: "Set up Docker Buildx",
 		Uses: core.DockerBuildxAction,
 	})
+
+	platforms := cfg.PushContainerToGhcr.Platforms
+	if platforms == "" {
+		platforms = "linux/amd64"
+	}
 	j.addStep(jobStep{
 		Name: "Build and push Docker image",
 		Uses: core.DockerBuildPushAction,
@@ -114,7 +119,7 @@ type=semver,pattern=v{{major}}
 			"push":      true,
 			"tags":      "${{ steps.meta.outputs.tags }}",
 			"labels":    "${{ steps.meta.outputs.labels }}",
-			"platforms": "linux/amd64,linux/arm64",
+			"platforms": platforms,
 		},
 	})
 	w.Jobs = map[string]job{"build-and-push-image": j}