no more linting errors for the main Dockerfile

Signed-off-by: Felix Bartels <felix@host-consultants.de>

docker/amd64/sqlite/Dockerfile

@@ -2,26 +2,28 @@
 # 	https://docs.docker.com/develop/develop-images/multistage-build/
 # 	https://whitfin.io/speeding-up-rust-docker-builds/
 ####################### VAULT BUILD IMAGE  #######################
-FROM alpine as vault
+FROM alpine:3.10 as vault
 
 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 \
+RUN apk add --no-cache --upgrade \
     curl \
     tar
 
 RUN mkdir /web-vault
 WORKDIR /web-vault
 
+SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
+
 RUN curl -L $URL | tar xz
 RUN ls
 
 ########################## BUILD IMAGE  ##########################
 # We need to use the Rust build image, because
 # we need the Rust compiler and Cargo tooling
-FROM rust as build
+FROM rust:1.36 as build
 
 # set sqlite as default for DB ARG for backward comaptibility
 ARG DB=sqlite
@@ -93,4 +95,4 @@ COPY --from=vault /web-vault ./web-vault
 COPY --from=build app/target/release/bitwarden_rs .
 
 # Configures the startup!
-CMD ./bitwarden_rs
+CMD ["./bitwarden_rs"]