Remove s3backer mounter as it's mostly unusable

cmd/s3driver/Dockerfile.full

@@ -1,56 +0,0 @@
-FROM golang:1.16-alpine as gobuild
-
-WORKDIR /build
-ADD . /build
-
-RUN go get -d -v ./...
-RUN CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o ./s3driver ./cmd/s3driver
-
-FROM debian:buster-slim as s3backer
-ARG S3BACKER_VERSION=1.5.0
-
-RUN apt-get update && apt-get install -y \
-  build-essential \
-  autoconf \
-  libcurl4-openssl-dev \
-  libfuse-dev \
-  libexpat1-dev \
-  libssl-dev \
-  zlib1g-dev \
-  psmisc \
-  pkg-config \
-  git && \
-  rm -rf /var/lib/apt/lists/*
-
-# Compile & install s3backer
-RUN git clone https://github.com/archiecobbs/s3backer.git /src/s3backer
-WORKDIR /src/s3backer
-RUN git checkout tags/${S3BACKER_VERSION}
-
-RUN ./autogen.sh && \
-  ./configure && \
-  make && \
-  make install
-
-FROM debian:buster-slim
-LABEL maintainers="Cyrill Troxler <cyrilltroxler@gmail.com>"
-LABEL description="csi-s3 image"
-COPY --from=s3backer /usr/bin/s3backer /usr/bin/s3backer
-
-# s3fs and some other dependencies
-RUN apt-get update && \
-  apt-get install -y \
-  libfuse2 gcc sqlite3 libsqlite3-dev \
-  s3fs psmisc procps libcurl4 xfsprogs curl unzip && \
-  rm -rf /var/lib/apt/lists/*
-
-# install rclone
-ARG RCLONE_VERSION=v1.54.1
-RUN cd /tmp \
-  && curl -O https://downloads.rclone.org/${RCLONE_VERSION}/rclone-${RCLONE_VERSION}-linux-amd64.zip \
-  && unzip /tmp/rclone-${RCLONE_VERSION}-linux-amd64.zip \
-  && mv /tmp/rclone-*-linux-amd64/rclone /usr/bin \
-  && rm -r /tmp/rclone*
-
-COPY --from=gobuild /build/s3driver /s3driver
-ENTRYPOINT ["/s3driver"]