add proxy support

images/privoxy/Dockerfile

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+FROM alpine:3.14
+
+ARG REMOTEEXEC_ADDR
+
+COPY user.action .
+COPY privoxy.conf .
+COPY start-proxy.sh .
+
+RUN apk update && apk add privoxy bash sudo socat
+
+CMD sudo chmod +x ./start-proxy.sh &&\
+    REMOTEEXEC_ADDR=$REMOTEEXEC_ADDR &&\
+    ./start-proxy.sh

images/privoxy/privoxy.conf

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+#confdir /etc/privoxy
+logdir /var/log/privoxy
+
+#listen-address 127.0.0.1:8118
+listen-address 0.0.0.0:8118
+
+debug 1024
+#debug 32768 # log all data read from the network
+#debug 65536 # Log the applying actions
+
+toggle 1
+enable-remote-toggle 0
+enable-edit-actions 1
+enable-remote-http-toggle 0
+enforce-blocks 1
+
+actionsfile user.action
+

images/privoxy/start-proxy.sh

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+#!/bin/bash
+
+test -e /tmp/forward-proxy/proxy.sock && sudo rm /tmp/forward-proxy/proxy.sock
+test -e /tmp/proxy/bots.sock && sudo rm /tmp/proxy/bots.sock
+
+socat UNIX-LISTEN:/tmp/forward-proxy/proxy.sock,reuseaddr,fork TCP:127.0.0.1:8118 &
+socat UNIX-LISTEN:/tmp/proxy/bots.sock,reuseaddr,fork TCP4:$REMOTEEXEC_ADDR &
+
+sudo chmod 777 /tmp/forward-proxy/proxy.sock
+sudo chmod 777 /tmp/proxy/bots.sock
+
+privoxy --no-daemon privoxy.conf

images/privoxy/user.action

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+{ +block{blocked} } 
+/ # Block all URLs
+
+{ -block }
+.github.com
+.docker.io
+.docker.com
+.githubusercontent.com
+.ubuntu.com
+
+# for buildeps
+chromium.googlesource.com
+
+# for chr-source
+chrome-infra-packages.appspot.com
+.googleapis.com
+.googlesource.com
+
+# for goma client
+chrome-infra-packages.appspot.com