chore(ci): use goreleaser

Dockerfile

@@ -1,20 +1,5 @@
-FROM docker.io/library/golang:1.23.4-alpine3.19 AS build
+FROM scratch AS build
 
-RUN apk add git make
-
-WORKDIR /workspace
-ADD ./ /workspace
-
-RUN make install \
-      DESTDIR=/cache \
-      PREFIX=/usr \
-      VERSION=${VERSION}
-
-FROM docker.io/library/alpine:3.21
-
-COPY --from=build /cache /
-
-WORKDIR /workspace
-VOLUME [ "/workspace" ]
+COPY dcmerge-* /usr/bin/dcmerge
 
 ENTRYPOINT [ "/usr/bin/dcmerge" ]