imp: reduce layers

Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:latest
 
 # Create Privoxy User
-RUN set -eux; \
+RUN set -ex; \
     addgroup --gid 7777 --system privoxy; \
     adduser \
         --disabled-password \
@@ -14,7 +14,9 @@ RUN set -eux; \
     mkdir /var/lib/privoxy/; \
     chown privoxy:privoxy /var/lib/privoxy/;
 
-# Install build related stuff
+ARG PRIVOXY_VERSION=3.0.34
+
+# Build Privoxy
 RUN set -eux; \
     apk add --no-cache --virtual build-tools \
         gcc \
@@ -26,12 +28,7 @@ RUN set -eux; \
         zlib-dev \
         pcre-dev \
         openssl-dev \
-        brotli-dev;
-
-ARG PRIVOXY_VERSION=3.0.34
-
-# Build Privoxy
-RUN set -eux; \
+        brotli-dev; \
     mkdir -p /usr/local/src/privoxy-${PRIVOXY_VERSION}-stable; \
     wget -O /var/lib/privoxy/privoxy-src.tar.gz https://sourceforge.net/projects/ijbswa/files/Sources/${PRIVOXY_VERSION}%20%28stable%29/privoxy-${PRIVOXY_VERSION}-stable-src.tar.gz/download; \
     tar -zxvf /var/lib/privoxy/privoxy-src.tar.gz -C /usr/local/src/; \
@@ -46,16 +43,15 @@ RUN set -eux; \
     apk del build-tools;
 
 # Add system tools
-RUN set -eux; \
-    apk add --no-cache --virtual sys-tools \
+RUN apk add --no-cache --virtual sys-tools \
         openssl \
         python3 \
         supervisor \
         bash \
         sed;
 
 # Enable Privoxy HTTPS inspection
-RUN set -eux; \
+RUN set -ex; \
     mv /usr/local/etc/privoxy/config /usr/local/etc/privoxy/config.orig; \
     sed -i '/^+set-image-blocker{pattern}/a +https-inspection \\' /usr/local/etc/privoxy/match-all.action;
 
@@ -69,7 +65,7 @@ COPY bin/privoxy-blocklist.sh /var/lib/privoxy/
 COPY docker-entrypoint.sh /usr/local/bin/
 
 # Set the correct permissions
-RUN set -eux; \
+RUN set -ex; \
     mkdir -p /usr/local/etc/privoxy/CA /usr/local/etc/privoxy/certs /usr/local/etc/privoxy/privman-rules; \
     chown -R privoxy:privoxy /usr/local/etc/privoxy/config /usr/local/etc/privoxy/CA /usr/local/etc/privoxy/certs /usr/local/etc/privoxy/privman-rules /var/lib/privoxy/privoxy-blocklist.conf; \
     chmod a+x /var/lib/privoxy/privman.py /var/lib/privoxy/privoxy-blocklist.sh /usr/local/bin/docker-entrypoint.sh; \