chore: fixed docker build format warnings

Dockerfile

@@ -1,13 +1,13 @@
 ARG UBUNTU_VERSION=20.04
 
-FROM ubuntu:${UBUNTU_VERSION} as ubuntu-nodejs
+FROM ubuntu:${UBUNTU_VERSION} AS ubuntu-nodejs
 ARG NODEJS_MAJOR_VERSION=18
 ENV DEBIAN_FRONTEND=nonintercative
 RUN apt-get update && apt-get install curl -y &&\
   curl --proto '=https' --tlsv1.2 -sSf -L https://deb.nodesource.com/setup_${NODEJS_MAJOR_VERSION}.x | bash - &&\
   apt-get install nodejs -y
 
-FROM ubuntu-nodejs as nodejs-builder
+FROM ubuntu-nodejs AS nodejs-builder
 RUN curl --proto '=https' --tlsv1.2 -sSf -L https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - &&\
   echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list &&\
   apt-get update && apt-get install gcc g++ make gnupg2 yarn -y
@@ -25,21 +25,21 @@ COPY \
   tsconfig.json \
   /app/
 
-FROM nodejs-builder as cardano-graphql-builder
+FROM nodejs-builder AS cardano-graphql-builder
 RUN yarn --frozen-lockfile --non-interactive &&\
   yarn build
 
-FROM nodejs-builder as cardano-graphql-production-deps
+FROM nodejs-builder AS cardano-graphql-production-deps
 RUN yarn --frozen-lockfile --non-interactive --production
 
-FROM frolvlad/alpine-glibc:alpine-3.11_glibc-2.30 as downloader
+FROM frolvlad/alpine-glibc:alpine-3.11_glibc-2.30 AS downloader
 RUN apk add curl
 RUN curl --proto '=https' --tlsv1.2 -sSf -L https://github.com/hasura/graphql-engine/raw/stable/cli/get.sh | sh
 ENV HASURA_GRAPHQL_ENABLE_TELEMETRY=false
 RUN hasura --skip-update-check update-cli --version v2.17.1
 RUN hasura --skip-update-check plugins install cli-ext
 
-FROM nodejs-builder as dev
+FROM nodejs-builder AS dev
 RUN apt-get update && apt-get install yarn -y
 RUN mkdir src
 RUN mkdir /node-ipc
@@ -57,7 +57,7 @@ ENV \
   POSTGRES_USER_FILE=/run/secrets/postgres_user
 WORKDIR /src
 
-FROM ubuntu-nodejs as background
+FROM ubuntu-nodejs AS background
 ARG NETWORK=mainnet
 # using local token registry as default
 ARG METADATA_SERVER_URI="http://token-metadata-registry:8091"
@@ -92,7 +92,7 @@ COPY --from=cardano-graphql-production-deps /app/packages/api-cardano-db-hasura/
 WORKDIR /app/packages/api-cardano-db-hasura/dist
 CMD ["node", "background.js"]
 
-FROM ubuntu-nodejs as server
+FROM ubuntu-nodejs AS server
 ARG NETWORK=mainnet
 ENV \
   CARDANO_NODE_CONFIG_PATH=/config/cardano-node/config.json \
@@ -117,6 +117,6 @@ WORKDIR /app/packages/server/dist
 EXPOSE 3100
 CMD ["node", "index.js"]
 
-FROM cardanofoundation/cf-token-metadata-registry-api:latest as token-registry
+FROM cardanofoundation/cf-token-metadata-registry-api:latest AS token-registry
 ADD scripts/token-registry-init.sh /app/entrypoint.sh
 ENTRYPOINT sh /app/entrypoint.sh