Upgrade to alpine 3.9 (#205)

* ⬆️ Upgrade to alpine 3.9

* ⬆️ Updates packages to latest on alpine 3.9

docker/Dockerfile

@@ -1,4 +1,4 @@
-ARG BUILD_FROM=alpine:3.8
+ARG BUILD_FROM=alpine:3.9
 # hadolint ignore=DL3006
 FROM ${BUILD_FROM}
 
@@ -33,19 +33,19 @@ RUN \
     && echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories \
     \
     && apk add --no-cache --virtual .build-dependencies \
-        curl=7.61.1-r1 \
-        git=2.18.1-r0 \
+        curl=7.63.0-r0 \
+        git=2.20.1-r0 \
         tar=1.31-r0 \
-        yarn=1.7.0-r0 \
+        yarn=1.12.3-r0 \
     \
     && apk add --no-cache \
-        apk-tools=2.10.1-r0 \
+        apk-tools=2.10.3-r1 \
         bash=4.4.19-r1 \
-        busybox=1.28.4-r3 \
-        ca-certificates=20171114-r3 \
+        busybox=1.29.3-r10 \
+        ca-certificates=20190108-r0 \
         nginx=1.14.2-r0 \
-        nodejs-current=9.11.1-r2 \
-        tzdata=2018f-r0 \
+        nodejs-current=11.3.0-r0 \
+        tzdata=2018i-r0 \
     \
     && if [ "${BUILD_ARCH}" = "i386" ]; then S6_ARCH="x86"; else S6_ARCH="${BUILD_ARCH}"; fi \
     \