Update Spire version and make Dockerfile support multi-arch build #864

Job	Run time
excludeFmtErrorf / exclude-fmt-errorf	7s
excludereplace / excludereplace	3s
checkgomod / checkgomod	15s
gogenerate / gogenerate	19s
golangci-lint / golangci-lint	41s
docker-build-and-test / push	1m 30s
restrictNSMDeps / restrict-nsm-deps	3s
shellcheck / shellcheck	13s
yamllint / yamllint	12s
	3m 23s

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