fix missing privoxy config files (FIX #209)

privoxy/Dockerfile

@@ -19,10 +19,14 @@ RUN set -xe \
     && chmod +x /usr/sbin/gosu \
     && apk del curl
 
-RUN sed -e '/^listen-address/s/127.0.0.1/0.0.0.0/' \
-        -e '/^accept-intercepted-requests/s/0/1/' \
-        -e '/^enforce-blocks/s/0/1/' \
-        -e '/^#debug/s/#//' /etc/privoxy/config.new > /etc/privoxy/config
+WORKDIR /etc/privoxy
+
+RUN set -xe \
+    && for cfg in *.new; do touch ${cfg%.new}; done \
+    && sed -e '/^listen-address/s/127.0.0.1/0.0.0.0/' \
+           -e '/^accept-intercepted-requests/s/0/1/' \
+           -e '/^enforce-blocks/s/0/1/' \
+           -e '/^#debug/s/#//' config.new > config
 
 VOLUME /etc/privoxy