CI: add Alpine (musl) and illumos jobs#90
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The arg0_override test invoked sh with argv[0] overridden and checked that the shell saw the override via $0. On Alpine, /bin/sh is BusyBox ash, which dispatches by argv[0] and treats $0 differently when argv[0] is not a recognized applet, making the test fail there. Extend the helper binary so it can print argv[0] (no extra args) or argv[1] (one arg), rename it to argv-echo, and rewrite arg0_override to use it instead of a shell. Drop the unused tests/just-echo.rs.
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