docker: delete Dockerfile.rpi (#6741)

[skip ci]

docker/Dockerfile.rpi

@@ -1,45 +0,0 @@
-FROM arm32v7/golang:1.14-alpine3.14 AS binarybuilder
-RUN apk --no-cache --no-progress add --virtual \
-  build-deps \
-  build-base \
-  git \
-  linux-pam-dev
-
-WORKDIR /gogs.io/gogs
-COPY . .
-RUN make build TAGS="cert pam"
-
-FROM arm32v7/alpine:3.14
-RUN wget https://github.com/tianon/gosu/releases/download/1.12/gosu-armhf -O /usr/sbin/gosu \
-  && chmod +x /usr/sbin/gosu \
-  && echo http://dl-2.alpinelinux.org/alpine/edge/community/ >> /etc/apk/repositories \
-  && apk --no-cache --no-progress add \
-  bash \
-  ca-certificates \
-  curl \
-  git \
-  linux-pam \
-  openssh \
-  s6 \
-  shadow \
-  socat \
-  tzdata \
-  rsync
-
-ENV GOGS_CUSTOM /data/gogs
-
-# Configure LibC Name Service
-COPY docker/nsswitch.conf /etc/nsswitch.conf
-
-WORKDIR /app/gogs
-COPY docker ./docker
-COPY --from=binarybuilder /gogs.io/gogs/gogs .
-
-RUN ./docker/finalize.sh
-
-# Configure Docker Container
-VOLUME ["/data", "/backup"]
-EXPOSE 22 3000
-HEALTHCHECK CMD (nc -z -w 3 localhost 22 && curl -o /dev/null -sS http://localhost:3000/healthcheck) || exit 1
-ENTRYPOINT ["/app/gogs/docker/start.sh"]
-CMD ["/bin/s6-svscan", "/app/gogs/docker/s6/"]