try again

.drone.yml

@@ -48,6 +48,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/amd64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=amd64
       username: nathan
       password:
         from_secret: registry_password
@@ -64,6 +67,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/arm64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=arm64
       username: nathan
       password:
         from_secret: registry_password
@@ -96,6 +102,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/amd64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=amd64
       username: nathan
       password:
         from_secret: registry_password
@@ -115,6 +124,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/arm64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=arm64
       username: nathan
       password:
         from_secret: registry_password
@@ -153,6 +165,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/amd64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=amd64
       username: nathan
       password:
         from_secret: registry_password
@@ -169,6 +184,9 @@ steps:
       repo: "registry.coadcorp.com/nathan/invertergui"
       dockerfile: Dockerfile
       platform: "linux/arm64"
+      build_args:
+        - TARGETOS=linux
+        - TARGETARCH=arm64
       username: nathan
       password:
         from_secret: registry_password

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