Update Alpine Image

docker/amd64/mysql/Dockerfile.alpine

@@ -1,4 +1,4 @@
-# Using multistage build: 
+# Using multistage build:
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/
 ####################### VAULT BUILD IMAGE  #######################
@@ -8,9 +8,9 @@ ENV VAULT_VERSION "v2.10.1"
 
 ENV URL "https://github.com/dani-garcia/bw_web_builds/releases/download/$VAULT_VERSION/bw_web_$VAULT_VERSION.tar.gz"
 
-RUN apk add --update-cache --upgrade \
-    curl \
-    tar
+RUN apk add --no-cache \
+  curl \
+  tar
 
 RUN mkdir /web-vault
 WORKDIR /web-vault
@@ -20,7 +20,7 @@ RUN ls
 
 ########################## BUILD IMAGE  ##########################
 # Musl build image for statically compiled binary
-FROM clux/muslrust:nightly-2018-12-01 as build
+FROM clux/muslrust:1.35.0-stable as build
 
 # set mysql backend
 ARG DB=mysql
@@ -28,10 +28,9 @@ ARG DB=mysql
 ENV USER "root"
 
 # Install needed libraries
-RUN apt-get update && apt-get install -y\
-    libmysqlclient-dev\
-    --no-install-recommends\
- && rm -rf /var/lib/apt/lists/*
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends libmysqlclient-dev \
+  && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
 
@@ -50,7 +49,7 @@ RUN cargo build --features ${DB} --release
 ######################## RUNTIME IMAGE  ########################
 # Create a new stage with a minimal image
 # because we already have a binary built
-FROM alpine:3.9
+FROM alpine:3.10
 
 ENV ROCKET_ENV "staging"
 ENV ROCKET_PORT=80
@@ -58,16 +57,14 @@ ENV ROCKET_WORKERS=10
 ENV SSL_CERT_DIR=/etc/ssl/certs
 
 # Install needed libraries
-RUN apk add \
-        openssl \
-        mariadb-connector-c \
-        ca-certificates \
-    && rm /var/cache/apk/*
+RUN apk add --no-cache \
+  ca-certificates \
+  mariadb-connector-c \
+  openssl
 
 RUN mkdir /data
 VOLUME /data
-EXPOSE 80
-EXPOSE 3012
+EXPOSE 80 3012
 
 # Copies the files from the context (Rocket.toml file and web-vault)
 # and the binary from the "build" stage to the current stage