Add librespot initial-volume option #506

Job	Run time
workflows / Shellcheck	5s
workflows / Shellcheck	5s
workflows / JSON Lint	3s
workflows / JSON Lint	3s
workflows / YAMLLint	23s
workflows / YAMLLint	23s
workflows / Gather add-on information	4s
workflows / Gather add-on information	4s
workflows / Prettier	4s
workflows / Prettier	4s
workflows / Hadolint	12s
workflows / Hadolint	12s
workflows / Lint Add-on	22s
workflows / Lint Add-on	22s
workflows / Build aarch64	6s
workflows / Build aarch64	43s
workflows / Build amd64	9s
workflows / Build amd64	42s
workflows / Build armv7	7s
workflows / Build armv7	40s
	4m 53s

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