De-duplicate run args passed to bazel image targets.

[psigen]

When 'bazel run' is called, it expects that the args specified in the BUILD file are not known to the run command and will prepend them to all other arguments.

However, we have already baked those commands into the image, because users expect that 'args' in the case of an image target will be included in the image. This templated script de-duplicates the args specified in the BUILD file by passing itself the number of args already included in the image.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: #2124

In the case of an image target being passed arguments, the arguments will actually be passed to the image
target by bazel twice, once at build time and another at runtime. This interferes with the expected order of
arguments (because command arguments are inserted before docker run arguments)

What is the new behavior?

The new behavior should match the documentation.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[psigen]

Please, if anyone has a good way to add unit tests for this, please help me add them

[github-actions]

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[psigen]

Hmm, I will try to rebase this to bring it up to date