rebase to alpine 3.8

Dockerfile

@@ -1,4 +1,4 @@
-FROM lsiobase/alpine.nginx:3.7
+FROM lsiobase/alpine.nginx:3.8
 
 # set version label
 ARG BUILD_DATE
@@ -9,8 +9,8 @@ LABEL maintainer="aptalca"
 # environment settings
 ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
 
-# install packages
 RUN \
+ echo "**** install runtime pacakges ****" && \
  apk add --no-cache \
 	curl \
 	php7-ctype \
@@ -18,18 +18,19 @@ RUN \
 	php7-tokenizer \
 	tar && \
  echo "**** install heimdall ****" && \
- HEIM_VER="$(curl -sX GET https://api.github.com/repos/linuxserver/Heimdall/releases/latest | grep 'tag_name' | cut -d\" -f4)" && \
  mkdir -p \
 	/var/www/localhost/heimdall && \
+ HEIM_VER=$(curl -sX GET "https://api.github.com/repos/linuxserver/Heimdall/releases/latest" \
+	| awk '/tag_name/{print $4;exit}' FS='[""]') && \
  curl -o \
  /tmp/heimdall.tar.gz -L \
 	"https://github.com/linuxserver/Heimdall/archive/${HEIM_VER}.tar.gz" && \
  tar xf \
  /tmp/heimdall.tar.gz -C \
 	/var/www/localhost/heimdall --strip-components=1 && \
- echo "** cleanup **" && \
+ echo "**** cleanup ****" && \
  rm -rf \
- /tmp/*
+	/tmp/*
 
 # add local files
 COPY root/ /