Support pkimetal via Unix socket#8531

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Copilot wants to merge 8 commits intomainfrom

copilot/support-pkimetal-unix-socket

Commits on Dec 18, 2025

Initial plan
Copilot
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Add Unix socket support for pkimetal integration

Copilot
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mcpherrinm
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Address code review feedback for Unix socket implementation

Copilot
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mcpherrinm
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Configure pkimetal with Viper YAML config for Unix socket

Copilot
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mcpherrinm
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Set timeout on HTTP client for regular HTTP connections

Copilot
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mcpherrinm
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Refactor HTTP client creation to enable connection reuse

Copilot
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mcpherrinm
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Use sync.Once for thread-safe client initialization

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mcpherrinm
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Commits on Dec 19, 2025

Fix app path, run as root like the rest of boulder to fix permissions
mcpherrinm
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