Fix Dockerfile linting issues

Author: chorrell

14/Dockerfile

@@ -19,8 +19,8 @@ RUN set -ex \
     { gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "$key" && gpg --batch --fingerprint "$key"; } ; \
   done
 
-ENV NPM_CONFIG_LOGLEVEL info
-ENV NODE_VERSION 14.17.1
+ENV NPM_CONFIG_LOGLEVEL=info
+ENV NODE_VERSION=14.17.1
 
 RUN curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/node-v$NODE_VERSION-linux-x64.tar.xz" \
   && curl -fsSLO --compressed "https://nodejs.org/dist/v$NODE_VERSION/SHASUMS256.txt.asc" \