heredoc makes Skaffold abort

[AndreasBergmeier6176]

Expected behavior

Should just build, since docker build works fine

Actual behavior

Checking cache...
 - foo/tcp-proxy: Error checking cache.
getting hash for artifact "foo/tcp-proxy": getting dependencies for "foo/tcp-proxy": file pattern [<<EOF] must match at least one file

Information

FROM alpine

RUN apk add --update bash socat

COPY <<"EOF" /usr/local/bin/tcp-proxy
if [ "$#" -ne 2 ]; then
    echo "usage: "bash /usr/local/bin/tcp-proxy host port"
    exit 1
fi
HOST="$1"
PORT="$2"
LISTEN_PORT=${LISTEN_PORT:-${PORT}}
echo "relay TCP/IP connections on :${LISTEN_PORT} to ${HOST}:${PORT}"
exec socat TCP-LISTEN:${LISTEN_PORT},fork,reuseaddr TCP:${HOST}:${PORT}
EOF

ENTRYPOINT ["bash", "/usr/local/bin/tcp-proxy"]