fix: default not allowed for secret

[DerekRoberts]

Defaults aren't allowed in secrets, so this PR provides a fallback value for oc_namespace anyway.

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Pull Request Overview

This PR removes the disallowed default on the oc_server input, introduces a workflow-level environment variable for the default server URL, and updates each job step to fall back to that default when the secret is not provided.

• Remove default from oc_server input to comply with secret usage rules
• Add DEFAULT_OC_SERVER env var at the top level
• Update each oc_server argument to use ${{ secrets.oc_server || env.DEFAULT_OC_SERVER }}

Comments suppressed due to low confidence (2)

.github/workflows/.pr-close.yml:63

• Consider updating the oc_server input description to mention that if no value is provided in secrets.oc_server, it will fall back to DEFAULT_OC_SERVER from the env section.

      oc_server:

.github/workflows/.pr-close.yml:126

• [nitpick] This expression is duplicated across multiple steps; consider extracting it into a reusable job-level or workflow-level variable (e.g., via defaults or a YAML anchor) to reduce duplication and simplify future updates.

          oc_server: ${{ secrets.oc_server || env.DEFAULT_OC_SERVER }}