fix: add immage flag for . image convention

[chrishumanitec]

Add -i|--image flag to allow for specifying the image to override when the image property in a score file has a value .

Description

• Added a new Flag to all commands
• Added a backwards compatible implementation to override .containers.{containerId}.image where the value is .

What does this PR do?

It is a convention when working with score that setting the image to . means: "the image in the current context". Usually, this means the image that is associated with the score file. The CI pipeline will know the generated image to be inserted.

Today, there are a number of workarounds involving --property overrides (which require knowledge of the container IDs) or even sed scripts such as:

sed -i -E "s/^(\\s+image:)\\s+.*\$/\\1 '${IMAGE_NAME}'/" score.yaml

This change will make updated in the current image much simpler:

score-humanitec delta -i my-image:my-tag --org....

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• New chore (expected functionality to be implemented)

Checklist:

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I've signed off with an email address that matches the commit author.

[astromechza]

Change looks good, just a duplicated typo in the flag description.

[chrishumanitec]

Change looks good, just a duplicated typo in the flag description.

Fixed the duplicated text and rebased to main.

[astromechza]

LGTM