I’ve seen this error too. The error is a result of trying to use your ARMv7 binary on ARMv6. All the quad-core Pi’s (2, 3 and 3+) are v7 while the single-core (A, B, and Zero) are v6. Installation works fine since Raspbian is “armhf”, however the binary will get a SIGKILL due to illegal instructions.
Could you please make the binary ARMv6 compatible to allow use on all Raspberry Pi’s? It’s as easy as adding GOARM=6 to your build environment. I believe the performance won’t be affected much (as all of Raspbian, the official Pi OS, is built that way). The former fg2it binaries were built that way too, however he has discontinued updates after official binaries for ARM became available.