Take 3

.dockerignore

@@ -29,6 +29,7 @@
 /bin
 /target
 !/target/**/monzo-ingestion
+!/target/**/test-binary
 /.idea
 LICENSE
 README.md

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM debian:bullseye-slim AS builder
+FROM busybox as platform_determiner
 ARG TARGETPLATFORM
 ARG BINARY_NAME
 WORKDIR /app
@@ -12,5 +12,5 @@ RUN case "$TARGETPLATFORM" in \
 
 FROM --platform=$TARGETPLATFORM debian:bullseye-slim
 ARG BINARY_NAME
-COPY --from=builder /usr/local/bin/${BINARY_NAME} /usr/local/bin/
+COPY --from=platform_determiner /usr/local/bin/${BINARY_NAME} /usr/local/bin/${BINARY_NAME}
 ENTRYPOINT ["/usr/local/bin/${BINARY_NAME}"]