add first prototype implementation (#1)

#### 📖 Summary

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#### 📑 Test Plan

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- [x] CI pipeline tests
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

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#### 📚 Additional Notes

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #1

Dockerfile

@@ -0,0 +1,68 @@
+FROM alpine:3.18.2
+
+#LABEL build_version=""
+LABEL maintainer="OCram85"
+ARG VERSION
+LABEL build_version="${VERSION}"
+LABEL org.opencontainers.image.authors="OCram85"
+LABEL org.opencontainers.image.vendor="OCram85"
+
+LABEL org.opencontainers.image.title="swarmproxy"
+LABEL org.opencontainers.image.description="tinyproxy docker image"
+LABEL org.opencontainers.image.licenses="AGPL-3.0"
+ARG TAG
+LABEL org.opencontainers.image.version="${TAG}"
+
+LABEL org.opencontainers.image.url="https://gitea.ocram85.com/OCram85/swarmproxy"
+LABEL org.opencontainers.image.source="https://gitea.ocram85.com/OCram85/swarmproxy.git"
+LABEL org.opencontainers.image.documentation="https://gitea.ocram85.com/OCram85/swarmproxy"
+
+# Use a custom UID/GID instead of the default system UID which has a greater possibility
+# for collisions with the host and other containers.
+ENV TINYPROXY_UID 5123
+ENV TINYPROXY_GID 5123
+
+ENV UPSTREAM_PROXY ""
+ENV PORT "8888"
+ENV TIMEOUT "600"
+ENV LOGLEVEL "Info"
+ENV MAXCLIENTS "600"
+ENV FILTER_FILE "/etc/tinyproxy/filter"
+
+# Curl is for healthchecks.
+RUN apk add --no-cache \
+      tinyproxy curl
+
+RUN mv /etc/tinyproxy/tinyproxy.conf /etc/tinyproxy/tinyproxy.default.conf
+
+RUN <<EOF cat >> /etc/tinyproxy/tinyproxy.conf
+User $TINYPROXY_UID
+Group $TINYPROXY_GID
+Port $PORT
+Timeout $TIMEOUT
+DefaultErrorFile "/usr/share/tinyproxy/default.html"
+
+StatHost "tinyproxy.stats"
+StatFile "/usr/share/tinyproxy/stats.html"
+
+LogLevel $LOGLEVEL
+MaxClients $MAXCLIENTS
+ViaProxyName "tinyproxy"
+
+#upstream http $UPSTREAM_PROXY "."
+
+Filter "$FILTER_FILE"
+FilterURLs Off
+FilterCaseSensitive Off
+FilterDefaultDeny Yes
+
+Allow 127.0.0.1/8
+Allow 10.0.0.0/8
+EOF
+
+RUN chown -R ${TINYPROXY_UID}:${TINYPROXY_GID} /etc/tinyproxy /var/log/tinyproxy
+USER ${TINYPROXY_UID}:${TINYPROXY_GID}
+
+EXPOSE 8888
+
+ENTRYPOINT ["/usr/bin/tinyproxy", "-d"]