Use env vars for workflow inputs #520
                
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Following https://docs.github.com/en/actions/reference/security/secure-use#use-an-intermediate-environment-variable, use environment variables instead of referencing Github workflow inputs directly in steps to prevent code injection.
Tested updated steps in my own fork: https://github.com/ezhang6811/aws-otel-python-instrumentation/actions/runs/18540890210
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