Just copy from the image in ddist

This ensures (with the help of Docker caching) that running
./dtest.sh && ./ddist.sh results in shipping the binary that was
actually tested.

.dockerignore

@@ -0,0 +1 @@
+./dist

ddist.sh

@@ -13,7 +13,6 @@ NAME="${IMG}-dist"
 BIN="tini"
 
 docker build -t "${IMG}" .
-
-docker run -it --name="${NAME}" --entrypoint="bash" --workdir="/tini" "${IMG}" "-c" "make clean && make"
+docker run -it --name="${NAME}" --entrypoint="true" "${IMG}" true
 docker cp "${NAME}:/tini/${BIN}" "${DIST_DIR}"
 docker rm "${NAME}"