Fix legacy Dockerfile warnings (#888)

* rm legacy format

* rm legacy format 2

Author: philkra

docker/ci/Dockerfile

@@ -12,13 +12,13 @@ ARG OS_CODE_NAME
 ARG OS_NAME
 ARG OS_VERSION
 
-ENV HOME /home/postgres
+ENV HOME=/home/postgres
 
 # Docker fails to set LOGNAME :(
-ENV LOGNAME root
-ENV CARGO_HOME /usr/local/cargo
-ENV RUSTUP_HOME /usr/local/rustup
-ENV PATH "${CARGO_HOME}/bin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin"
+ENV LOGNAME=root
+ENV CARGO_HOME=/usr/local/cargo
+ENV RUSTUP_HOME=/usr/local/rustup
+ENV PATH="${CARGO_HOME}/bin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin"
 
 COPY docker/ci/setup.sh /
 COPY tools/dependencies.sh /