fix: Remove unsupported environment variables

[stormcat24]

Summary

Removed environment variables that are not supported by KECS core.

Problem

The action was exporting environment variables that have no corresponding support in KECS:

• KECS_ADMIN_ENDPOINT - Not used by KECS
• KECS_INSTANCE - Not used by KECS

These were action-specific variables that could mislead users into thinking KECS supports them.

Solution

Removed unsupported environment variables. Users should use outputs instead:

• ${{ steps.kecs.outputs.admin-endpoint }} instead of $KECS_ADMIN_ENDPOINT
• ${{ steps.kecs.outputs.instance-name }} instead of $KECS_INSTANCE

Supported Environment Variables

The action now exports only officially supported environment variables:

• AWS_ENDPOINT_URL - For AWS CLI (points to KECS API)
• KECS_ENDPOINT - For direct API access (supported by KECS config)
• KUBECONFIG - For kubectl access

Changes

• action.yml: Removed KECS_ADMIN_ENDPOINT and KECS_INSTANCE exports
• README.md: Updated environment variables documentation
• test-setup.yml: Removed verification of unsupported environment variables

Breaking Change

⚠️ Minor breaking change: If users were relying on $KECS_ADMIN_ENDPOINT or $KECS_INSTANCE environment variables, they should switch to using outputs:

# Before
- run: echo "Admin: $KECS_ADMIN_ENDPOINT"
- run: echo "Instance: $KECS_INSTANCE"

# After
- run: echo "Admin: ${{ steps.kecs.outputs.admin-endpoint }}"
- run: echo "Instance: ${{ steps.kecs.outputs.instance-name }}"

However, this is unlikely to affect users since these variables were not documented as KECS-supported features.

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