Update hello-world
Update hello-world

Changes:

- https://github.com/docker-library/hello-world/commit/fc03878: Merge pull request https://github.com/docker-library/hello-world/pull/91 from infosiftr/riscv64
- https://github.com/docker-library/hello-world/commit/584b134: Use "arch-test" to actively test as many binaries as the current host can support
- https://github.com/docker-library/hello-world/commit/06d4f12: Add riscv64
- https://github.com/docker-library/hello-world/commit/10d34b3: Update README from https://github.com/docker-library/docs/commit/d5df59ae28730ecd6550a19e47349f55a2b3d1c2
- https://github.com/docker-library/hello-world/commit/cb60bd8: Switch from SKS to Ubuntu keyserver
- https://github.com/docker-library/hello-world/commit/07c029f: Merge pull request https://github.com/docker-library/hello-world/pull/89 from alenzen/patch
- https://github.com/docker-library/hello-world/commit/7476122: fix URLs
- https://github.com/docker-library/hello-world/commit/6517128: Add explicit SHELL in Makefile

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