try again

Dockerfile

@@ -1,14 +1,15 @@
-FROM --platform=$BUILDPLATFORM golang:1.26-alpine as builder
+FROM golang:1.26-alpine as builder
 
 ARG TARGETOS=linux
-ARG TARGETARCH
+ARG TARGETARCH=amd64
 ARG TARGETVARIANT
 
 RUN mkdir /build
 COPY . /build/
 WORKDIR /build
 RUN set -eux; \
-    GOARM="${TARGETVARIANT#v}"; \
+    GOARM=""; \
+    if [ "${TARGETARCH}" = "arm" ] && [ -n "${TARGETVARIANT:-}" ]; then GOARM="${TARGETVARIANT#v}"; fi; \
     CGO_ENABLED=0 GOOS="${TARGETOS}" GOARCH="${TARGETARCH}" GOARM="${GOARM}" go build -o invertergui ./cmd/invertergui
 
 FROM scratch