fix(agent): use TARGETVARIANT to set GOARM for ARMv6 (#5782) #5801
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The unified Dockerfile cross-compiles with GOARCH=${TARGETARCH}, but
for ARM targets TARGETARCH is just "arm" for both v6 and v7. Without
GOARM, Go defaults to 7, producing ARMv7 instructions that cause
SIGILL on ARMv6 hardware (e.g. Raspberry Pi Zero/1).
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The unified Dockerfile cross-compiles with GOARCH=${TARGETARCH}, but for ARM targets TARGETARCH is just "arm" for both v6 and v7. Without GOARM, Go defaults to 7, producing ARMv7 instructions that cause SIGILL on ARMv6 hardware (e.g. Raspberry Pi Zero/1).