Fix license header CI by adding Apache license to Makefile

[Copilot]

Summary

This PR fixes the failing license header CI check by adding the required Apache Software Foundation license header to the Makefile.

Problem

The hawkeye license checker (used in CI) was failing because the Makefile was missing the Apache 2.0 license header that is present in all other source files in the repository.

Solution

Added the standard Apache 2.0 license header to the top of the Makefile, matching the format used consistently across all other files in the codebase (Cargo.toml, .yml files, .toml files, .rs files, etc.).

Verification

Verified locally by running the hawkeye license checker:

• Before: ERROR hawkeye::subcommand: subcommand.rs:110 Found missing header files: ["/github/workspace/Makefile"]
• After: INFO hawkeye::subcommand: subcommand.rs:116 No missing header file has been found.

Fixes the CI failure referenced in https://github.com/datafusion-contrib/datafusion-orc/actions/runs/18605628066/job/53054331467?pr=143

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix license header CI</issue_title>
<issue_description>https://github.com/datafusion-contrib/datafusion-orc/actions/runs/18605628066/job/53054331467?pr=143</issue_description>

<agent_instructions>Fix CI by adding appropriate license header to missing files</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #144

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