Docker: Don't use legacy ENV syntax (#93218)

chore(docker): don't use legacy ENV syntax

Dockerfile

@@ -30,7 +30,7 @@ COPY tsconfig.json .eslintrc .editorconfig .browserslistrc .prettierrc.js ./
 COPY scripts scripts
 COPY emails emails
 
-ENV NODE_ENV production
+ENV NODE_ENV=production
 RUN yarn build
 
 FROM ${GO_IMAGE} as go-builder

devenv/docker/blocks/collectd/Dockerfile

@@ -1,6 +1,6 @@
 FROM    ubuntu:xenial
 
-ENV     DEBIAN_FRONTEND noninteractive
+ENV     DEBIAN_FRONTEND=noninteractive
 
 RUN     apt-get -y update
 RUN     apt-get -y install collectd curl python-pip

devenv/docker/buildcontainer/Dockerfile

@@ -2,18 +2,18 @@ FROM centos:6.6
 
 RUN yum install -y initscripts curl tar gcc libc6-dev git
 
-ENV GOLANG_VERSION 1.4.2
+ENV GOLANG_VERSION=1.4.2
 
 RUN curl -sSL https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz \
 		| tar -v -C /usr/src -xz
 
 RUN cd /usr/src/go/src && ./make.bash --no-clean 2>&1
 
-ENV PATH /usr/src/go/bin:$PATH
+ENV PATH=/usr/src/go/bin:$PATH
 
 RUN mkdir -p /go/src /go/bin && chmod -R 777 /go
-ENV GOPATH /go
-ENV PATH /go/bin:$PATH
+ENV GOPATH=/go
+ENV PATH=/go/bin:$PATH
 
 WORKDIR /go/src/github.com/grafana/grafana
 

devenv/docker/ha-test-unified-alerting/Dockerfile

@@ -7,6 +7,6 @@ WORKDIR /go/src/webhook
 RUN mkdir /tmp/logs
 RUN go build -o /bin webhook-listener.go
 
-ENV PORT 8080
+ENV PORT=8080
 
 ENTRYPOINT [ "/bin/webhook-listener" ]