Display info when there is no change in local source

[shashwathi]

Pull request

What this PR does / why we need it

when the local source hasnt changed, display info No sourc code is changed, instead of Published source.

Which issue(s) this PR fixes

Fixes #175

Describe testing done for PR

case when no change in code + no change in spec

% tanzu apps workload apply pet-img-6 --source-image gcr.io/SOMETHING/petclinictestjar:source --local-path /Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar  
? Publish source in "/Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar" to "gcr.io/SOMETHINGpetclinictestjar:source"? It may be visible to others who can pull images from that repository Yes
Publishing source in "/Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar" to "gcr.io/SOMETHING/petclinictestjar:source"...
No source code is changed
Workload is unchanged, skipping update

case when no change in code + change in spec

tanzu apps workload apply pet-img-6 --source-image gcr.io/SOMETHING/petclinictestjar:source --local-path /Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar  --label type=web
? Publish source in "/Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar" to "gcr.io/SOMETHING/petclinictestjar:source"? It may be visible to others who can pull images from that repository Yes
Publishing source in "/Users/snagarajared/workspace/spring-petclinic/target/spring-petclinic-2.6.0-SNAPSHOT.jar" to "gcr.io/SOMETHING/petclinictestjar:source"...
No source code is changed
Update workload:
  1,  1   |---
  2,  2   |apiVersion: carto.run/v1alpha1
  3,  3   |kind: Workload
  4,  4   |metadata:
      5 + |  labels:
      6 + |    type: web
  5,  7   |  name: pet-img-6
  6,  8   |  namespace: default
  7,  9   |spec:
  8, 10   |  source:
...

? Really update the workload "pet-img-6"? Yes
Updated workload "pet-img-6"

To see logs:   "tanzu apps workload tail pet-img-6"
To get status: "tanzu apps workload get pet-img-6"

[rashedkvm]

question: Is the intent for #175 to prevent pushing the source image when there is no change in the source? Is that no longer in the scope? According to this PR, apps plugin will push the image and does not prevent it when there is no source change. Please see

apps-cli-plugin/pkg/commands/workload.go

Line 379 in a85642b

digestedImage, err := source.ImgpkgPush(ctx, contentDir, fileExclusions, taggedImage)

[shashwathi]

Is the intent for #175 to prevent pushing the source image when there is no change in the source?

When there is no change in source, underlying lib imgpkg is not pushing the blob to registry. The scope was changed to update the msging to indicate the same.

[rashedkvm]

When there is no change in source, underlying lib imgpkg is not pushing the blob to registry.

Are you sure?