fix: add environment setup step to integration tests workflow · box/boxcli@efddd23

Build and test: test/integration/helpers/test-helper.js#L7

'once' is assigned a value but never used

Build and test: test/integration/helpers/test-helper.js#L13

'darwinKeychainGetPassword' is assigned a value but never used

Build and test: test/integration/helpers/test-helper.js#L95

'stdout' is assigned a value but never used

Build and test: test/integration/helpers/test-helper.js#L95

'stderr' is assigned a value but never used

Build and test: test/integration/helpers/test-helper.js#L106

Unexpected sync method: 'existsSync'

Build and test: test/integration/helpers/test-helper.js#L107

Unexpected sync method: 'rmSync'

Build and test: test/integration/helpers/test-helper.js#L111

Unexpected sync method: 'mkdirSync'

Build and test: test/integration/helpers/test-helper.js#L112

Unexpected sync method: 'chmodSync'

Build and test: test/integration/helpers/test-helper.js#L136

Unexpected sync method: 'writeFileSync'

Build and test: test/integration/helpers/test-helper.js#L137

Unexpected sync method: 'chmodSync'

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