Add workflow to build packages for iOS. #259
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1 error
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                          Invalid workflow file: 
                        .github/workflows/pull_request.yml#L10
                      
                       
                  error parsing called workflow
".github/workflows/pull_request.yml"
-> "./.github/workflows/swift_package_test.yml"
: (Line: 235, Col: 24): Unexpected symbol: '??'. Located at position 41 within expression: fromJson(inputs.ios_host_xcode_versions ?? inputs.macos_xcode_versions), (Line: 235, Col: 24): Unexpected value '${{ fromJson(inputs.ios_host_xcode_versions ?? inputs.macos_xcode_versions) }}', (Line: 236, Col: 21): Unexpected symbol: '??'. Located at position 35 within expression: fromJson(inputs.ios_host_versions ?? inputs.macos_versions), (Line: 236, Col: 21): Unexpected value '${{ fromJson(inputs.ios_host_versions ?? inputs.macos_versions) }}', (Line: 237, Col: 15): Unexpected symbol: '??'. Located at position 32 within expression: fromJson(inputs.ios_host_archs ?? inputs.macos_archs), (Line: 237, Col: 15): Unexpected value '${{ fromJson(inputs.ios_host_archs ?? inputs.macos_archs) }}', (Line: 239, Col: 13): Unexpected symbol: '??'. Located at position 49 within expression: fromJson(inputs.ios_host_exclude_xcode_versions ?? inputs.macos_exclude_xcode_versions), (Line: 239, Col: 13): Unexpected value '${{ fromJson(inputs.ios_host_exclude_xcode_versions ?? inputs.macos_exclude_xcode_versions) }}' 
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