Fix GitHub Actions Cache setting an incorrect Content-Range header

Content-Range is 0 indexed, although nobody seemed to have encountered
any issues as a result of this on github.com, but on GitHub Enterprise
server it resulted in a InvalidChunkException error

Author: j-mie

src/vcpkg/binarycaching.cpp

@@ -923,15 +923,15 @@ namespace
 
             size_t upload_count = 0;
             auto cache_size = m_fs.file_size(zip_path, VCPKG_LINE_INFO);
+            if (cache_size == 0) return upload_count;
 
             if (auto cacheId = reserve_cache_entry(request.spec.name(), abi, cache_size))
             {
                 const std::string custom_headers[] = {
                     m_token_header,
                     m_accept_header.to_string(),
                     "Content-Type: application/octet-stream",
-                    "Content-Range: bytes 0-" + std::to_string(cache_size) + "/*",
-                };
+                    fmt::format("Content-Range: bytes 0-{}/{}", cache_size - 1, cache_size)};
 
                 PrintingDiagnosticContext pdc{msg_sink};
                 WarningDiagnosticContext wdc{pdc};