fix[makepkg]: Add pacman-makepkg

- makepkg has been split into a separate package

Signed-off-by: Jeffrey Bouter <jb@warpnet.nl>

Author: jbouter

Dockerfile

@@ -2,8 +2,8 @@ FROM alpine:3
 
 # hadolint ignore=DL3018
 RUN apk update --no-cache \
- && apk add --no-cache openssh-client openssh-keygen shadow pacman runuser git \
- grep binutils gcc \
+ && apk add --no-cache openssh-client openssh-keygen shadow pacman pacman-makepkg \
+ runuser git grep binutils gcc \
  && rm -rf /var/cache/apk/*
 
 COPY entrypoint.sh /entrypoint.sh