Basic repository files added

Dockerfile

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+# Image page: <https://hub.docker.com/_/alpine>
+FROM alpine:latest as builder
+
+# e.g.: `docker build --build-arg "VERSION=0.8.13" .`
+ARG VERSION="0.8.13"
+
+RUN set -x \
+    && apk add --no-cache \
+        ca-certificates \
+        linux-headers \
+        build-base \
+        git \
+    && update-ca-certificates \
+    && git clone --branch ${VERSION} https://github.com/z3APA3A/3proxy.git /tmp/3proxy \
+    && cd /tmp/3proxy \
+    && echo '#define ANONYMOUS 1' >> /tmp/3proxy/src/3proxy.h \
+    && make -f Makefile.Linux
+
+FROM alpine:latest
+
+LABEL \
+    org.label-schema.name="3proxy" \
+    org.label-schema.description="Tiny free proxy server" \
+    org.label-schema.url="https://github.com/tarampampam/3proxy-docker" \
+    org.label-schema.vcs-url="https://github.com/tarampampam/3proxy-docker" \
+    org.label-schema.docker.cmd="docker run --rm -d -p \"3128:3128/tcp\" -p \"1080:1080/tcp\" this_image" \
+    org.label-schema.vendor="tarampampam" \
+    org.label-schema.license="WTFPL" \
+    org.label-schema.schema-version="1.0"
+
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /tmp/3proxy/src/3proxy /usr/bin/3proxy
+COPY --from=builder /tmp/3proxy/cfg/3proxy.cfg.sample /etc/3proxy/3proxy.cfg
+
+RUN set -x \
+    # Unprivileged user creation <https://stackoverflow.com/a/55757473/12429735RUN>
+    && adduser \
+        --disabled-password \
+        --gecos "" \
+        --home /nonexistent \
+        --shell /sbin/nologin \
+        --no-create-home \
+        --uid 10001 \
+        3proxy \
+    && touch /etc/3proxy/passwd \
+    && chown 3proxy:3proxy -R /etc/3proxy
+
+# Use an unprivileged user
+USER 3proxy:3proxy
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+CMD ["/usr/bin/3proxy", "/etc/3proxy/3proxy.cfg"]