avoiding curl by using busybox' wget, deduplication of commands

Dockerfile

@@ -10,54 +10,51 @@ ENV S6_READ_ONLY_ROOT 1
 
 RUN \
 # Install dependencies
-    apk add --no-cache tzdata nginx php7-fpm php7-json php7-gd \
+    apk add --no-cache gnupg libcap nginx php7-fpm php7-json php7-gd \
-        php7-opcache php7-pdo_mysql php7-pdo_pgsql \
+        php7-opcache php7-pdo_mysql php7-pdo_pgsql tzdata \
 # Remove (some of the) default nginx config
     && rm -f /etc/nginx.conf /etc/nginx/conf.d/default.conf /etc/php7/php-fpm.d/www.conf \
     && rm -rf /etc/nginx/sites-* \
 # Ensure nginx logs, even if the config has errors, are written to stderr
     && ln -s /dev/stderr /var/log/nginx/error.log \
 # Install PrivateBin
-    && apk add --no-cache gnupg curl libcap \
     && export GNUPGHOME="$(mktemp -d)" \
     && gpg2 --list-public-keys || /bin/true \
-    && curl -s https://privatebin.info/key/release.asc | gpg2 --import - \
+    && wget -qO - https://privatebin.info/key/release.asc | gpg2 --import - \
     && rm -rf /var/www/* \
     && cd /tmp \
-    && curl -Ls ${PBURL}releases/download/${RELEASE}/PrivateBin-${RELEASE}.tar.gz.asc > PrivateBin-${RELEASE}.tar.gz.asc \
+    && wget -qO ${RELEASE}.tar.gz.asc ${PBURL}releases/download/${RELEASE}/PrivateBin-${RELEASE}.tar.gz.asc \
-    && curl -Ls ${PBURL}archive/${RELEASE}.tar.gz > PrivateBin-${RELEASE}.tar.gz \
+    && wget -q ${PBURL}archive/${RELEASE}.tar.gz \
-    && gpg2 --verify PrivateBin-${RELEASE}.tar.gz.asc \
+    && gpg2 --verify ${RELEASE}.tar.gz.asc \
     && cd /var/www \
-    && tar -xzf /tmp/PrivateBin-${RELEASE}.tar.gz --strip 1 \
+    && tar -xzf /tmp/${RELEASE}.tar.gz --strip 1 \
     && rm *.md cfg/conf.sample.php \
-    && mv cfg /srv \
+    && mv cfg lib tpl vendor /srv \
-    && mv lib /srv \
-    && mv tpl /srv \
-    && mv vendor /srv \
     && mkdir -p /srv/data \
     && sed -i "s#define('PATH', '');#define('PATH', '/srv/');#" index.php \
 # Install s6 overlay for service management
-    && curl -s https://keybase.io/justcontainers/key.asc | gpg2 --import - \
+    && wget -qO - https://keybase.io/justcontainers/key.asc | gpg2 --import - \
     && cd /tmp \
     && S6ARCH=$(uname -m) \
     && case ${S6ARCH} in \
            x86_64) S6ARCH=amd64;; \
            armv7l) S6ARCH=armhf;; \
        esac \
-    && curl -Ls ${S6URL}${S6RELEASE}/s6-overlay-${S6ARCH}.tar.gz.sig > s6-overlay-${S6ARCH}.tar.gz.sig \
+    && wget -q ${S6URL}${S6RELEASE}/s6-overlay-${S6ARCH}.tar.gz.sig \
-    && curl -Ls ${S6URL}${S6RELEASE}/s6-overlay-${S6ARCH}.tar.gz > s6-overlay-${S6ARCH}.tar.gz \
+    && wget -q ${S6URL}${S6RELEASE}/s6-overlay-${S6ARCH}.tar.gz \
     && gpg2 --verify s6-overlay-${S6ARCH}.tar.gz.sig \
     && tar -xzf s6-overlay-${S6ARCH}.tar.gz -C / \
 # Support running s6 under a non-root user
     && mkdir -p /etc/services.d/nginx/supervise /etc/services.d/php-fpm7/supervise \
-    && mkfifo /etc/services.d/nginx/supervise/control \
+    && mkfifo \
-    && mkfifo /etc/services.d/php-fpm7/supervise/control \
+        /etc/services.d/nginx/supervise/control \
-    && mkfifo /etc/s6/services/s6-fdholderd/supervise/control \
+        /etc/services.d/php-fpm7/supervise/control \
+        /etc/s6/services/s6-fdholderd/supervise/control \
     && setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \
     && chown -R nobody.www-data /var/lib/nginx /var/tmp/nginx /var/www /srv/* /etc/services.d /etc/s6 /run \
 # Clean up
     && rm -rf "${GNUPGHOME}" /tmp/* \
-    && apk del gnupg curl libcap
+    && apk del gnupg libcap
 
 COPY etc/ /etc/