feat: allow specifying debug runtime in skaffold.yaml for artifact

[gsquared94]

Fixes: #2203

Description

Allow specifying the debug runtime for artifacts in skaffold.yaml.

Testing instructions
In the integration/examples/getting-started project:

1. Modify the Dockerfile by deleting line 12 ( ENV GOTRACEBACK=single).
2. Run skaffold debug -v DEBUG.
3. Search the output for the text Image "getting-started" not configured for debugging: unable to determine runtime. This implies that Skaffold couldn't identify the language runtime for this artifact for debug.
4. Now modify the skaffold.yaml file to:

apiVersion: skaffold/v4beta1
kind: Config
build:
  artifacts:
  - image: skaffold-example
    runtimeType: go     # added runtime type explicitly
manifests:
  rawYaml:
  - k8s-pod.yaml

5. Run skaffold debug -v DEBUG again.
6. Search the output for the text Artifact "skaffold-example" has Go runtime: specified by user in skaffold config. This implies that Skaffold was able to identify Golang as the language runtime for this artifact for debug.

[codecov]

Codecov Report

Merging #8295 (ba56b71) into main (290280e) will decrease coverage by 4.42%.
The diff coverage is 54.96%.

@@            Coverage Diff             @@
##             main    #8295      +/-   ##
==========================================
- Coverage   70.48%   66.06%   -4.43%     
==========================================
  Files         515      603      +88     
  Lines       23150    29556    +6406     
==========================================
+ Hits        16317    19525    +3208     
- Misses       5776     8567    +2791     
- Partials     1057     1464     +407     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 413 more

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[aaron-prindle]

Seems there is gofmt errors:

Gofmt errors in files:
./pkg/skaffold/runner/build.go
diff ./pkg/skaffold/runner/build.go.orig ./pkg/skaffold/runner/build.go
--- ./pkg/skaffold/runner/build.go.orig
+++ ./pkg/skaffold/runner/build.go
@@ -[13](https://github.com/GoogleContainerTools/skaffold/actions/runs/3837457153/jobs/6532785477#step:4:14)9,8 +139,8 @@
 	var bRes []graph.Artifact
 	for _, artifact := range artifacts {
 		bRes = append(bRes, graph.Artifact{
-			ImageName: artifact.ImageName,
-			Tag:       tags[artifact.ImageName],
+			ImageName:   artifact.ImageName,
+			Tag:         tags[artifact.ImageName],
 			RuntimeType: artifact.RuntimeType,
 		})
 	}
FAILED hack/gofmt.sh

[aaron-prindle]

LGTM!