docker build.sh teeny 4mb img woo

Dockerfile

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+FROM golang:1.21-bullseye as builder
+
+COPY . /go/src/app
+WORKDIR /go/src/app
+RUN GOOS=linux CGO_ENABLED=0 go build -o /bin/app -a -installsuffix cgo -trimpath -ldflags "-s -w" -tags musl
+
+FROM scratch
+COPY --from=builder /bin/app /bin/
+CMD []
+ENTRYPOINT ["/bin/app"]

build.sh

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+#! /bin/bash
+
+set -euo pipefail
+
+docker rmi k3d-test:5001/gitea/echo-server:latest || true
+docker build -t k3d-test:5001/gitea/echo-server:latest .
+docker images | grep k3d-test:5001/gitea/echo-server
+docker push k3d-test:5001/gitea/echo-server:latest